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class="vector-menu-content-list"> </ul> </div> </div> <div id="p-vector-user-menu-userpage" class="vector-menu mw-portlet emptyPortlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> </div> </div> <nav class="vector-appearance-landmark" aria-label="Aparença"> <div id="vector-appearance-dropdown" class="vector-dropdown " title="Change the appearance of the page's font size, width, and color" > <input type="checkbox" id="vector-appearance-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-appearance-dropdown" class="vector-dropdown-checkbox " aria-label="Aparença" > <label id="vector-appearance-dropdown-label" for="vector-appearance-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-appearance mw-ui-icon-wikimedia-appearance"></span> <span class="vector-dropdown-label-text">Aparença</span> </label> <div class="vector-dropdown-content"> <div id="vector-appearance-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <div id="p-vector-user-menu-notifications" class="vector-menu mw-portlet emptyPortlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> </div> </div> <div id="p-vector-user-menu-overflow" class="vector-menu mw-portlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="pt-sitesupport-2" class="user-links-collapsible-item mw-list-item user-links-collapsible-item"><a data-mw="interface" href="//donate.wikimedia.org/wiki/Special:FundraiserRedirector?utm_source=donate&utm_medium=sidebar&utm_campaign=C13_ca.wikipedia.org&uselang=ca" class=""><span>Donatius</span></a> </li> <li id="pt-createaccount-2" class="user-links-collapsible-item mw-list-item user-links-collapsible-item"><a data-mw="interface" href="/w/index.php?title=Especial:Crea_compte&returnto=Longitud+d%27ona" title="Us animem a crear un compte i iniciar una sessió, encara que no és obligatori" class=""><span>Crea un compte</span></a> </li> <li id="pt-login-2" class="user-links-collapsible-item mw-list-item user-links-collapsible-item"><a data-mw="interface" href="/w/index.php?title=Especial:Registre_i_entrada&returnto=Longitud+d%27ona" title="Us animem a registrar-vos, però no és obligatori [o]" accesskey="o" class=""><span>Inicia la sessió</span></a> </li> </ul> </div> </div> </div> <div id="vector-user-links-dropdown" class="vector-dropdown vector-user-menu vector-button-flush-right vector-user-menu-logged-out" title="Més opcions" > <input type="checkbox" id="vector-user-links-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-user-links-dropdown" class="vector-dropdown-checkbox " aria-label="Eines personals" > <label id="vector-user-links-dropdown-label" 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class="vector-menu-content-list"> <li id="pt-anoncontribs" class="mw-list-item"><a href="/wiki/Especial:Contribucions_pr%C3%B2pies" title="Una llista de les modificacions fetes des d'aquesta adreça IP [y]" accesskey="y"><span>Contribucions</span></a></li><li id="pt-anontalk" class="mw-list-item"><a href="/wiki/Especial:Discussi%C3%B3_personal" title="Discussió sobre les edicions per aquesta adreça ip. [n]" accesskey="n"><span>Discussió per aquest IP</span></a></li> </ul> </div> </div> </div> </div> </nav> </div> </header> </div> <div class="mw-page-container"> <div class="mw-page-container-inner"> <div class="vector-sitenotice-container"> <div id="siteNotice"></div> </div> <div class="vector-column-start"> <div class="vector-main-menu-container"> <div id="mw-navigation"> <nav id="mw-panel" class="vector-main-menu-landmark" aria-label="Lloc"> <div id="vector-main-menu-pinned-container" class="vector-pinned-container"> </div> </nav> </div> </div> <div class="vector-sticky-pinned-container"> <nav id="mw-panel-toc" aria-label="Contingut" data-event-name="ui.sidebar-toc" class="mw-table-of-contents-container vector-toc-landmark"> <div id="vector-toc-pinned-container" class="vector-pinned-container"> <div id="vector-toc" class="vector-toc vector-pinnable-element"> <div class="vector-pinnable-header vector-toc-pinnable-header vector-pinnable-header-pinned" data-feature-name="toc-pinned" data-pinnable-element-id="vector-toc" > <h2 class="vector-pinnable-header-label">Contingut</h2> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-toc.pin">mou a la barra lateral</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-toc.unpin">amaga</button> </div> <ul class="vector-toc-contents" id="mw-panel-toc-list"> <li id="toc-mw-content-text" class="vector-toc-list-item vector-toc-level-1"> <a href="#" class="vector-toc-link"> <div class="vector-toc-text">Inici</div> </a> </li> <li id="toc-Unitats" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Unitats"> <div class="vector-toc-text"> <span class="vector-toc-numb">1</span> <span>Unitats</span> </div> </a> <ul id="toc-Unitats-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Longitud_d'ona_associada_a_partícules" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Longitud_d'ona_associada_a_partícules"> <div class="vector-toc-text"> <span class="vector-toc-numb">2</span> <span>Longitud d'ona associada a partícules</span> </div> </a> <ul id="toc-Longitud_d'ona_associada_a_partícules-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Longitud_d'ona_tèrmica" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Longitud_d'ona_tèrmica"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>Longitud d'ona tèrmica</span> </div> </a> <ul id="toc-Longitud_d'ona_tèrmica-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Longitud_d'ona,_freqüència,_període_i_velocitat" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Longitud_d'ona,_freqüència,_període_i_velocitat"> <div class="vector-toc-text"> <span class="vector-toc-numb">4</span> <span>Longitud d'ona, freqüència, període i velocitat</span> </div> </a> <ul id="toc-Longitud_d'ona,_freqüència,_període_i_velocitat-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Vegeu_també" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Vegeu_també"> <div class="vector-toc-text"> <span class="vector-toc-numb">5</span> <span>Vegeu també</span> </div> </a> <ul id="toc-Vegeu_també-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Referències" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Referències"> <div class="vector-toc-text"> <span class="vector-toc-numb">6</span> <span>Referències</span> </div> </a> <ul id="toc-Referències-sublist" class="vector-toc-list"> </ul> </li> </ul> </div> </div> </nav> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <nav aria-label="Contingut" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" > <input type="checkbox" id="vector-page-titlebar-toc-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-titlebar-toc" class="vector-dropdown-checkbox " aria-label="Commuta la taula de continguts." > <label id="vector-page-titlebar-toc-label" for="vector-page-titlebar-toc-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-listBullet mw-ui-icon-wikimedia-listBullet"></span> <span class="vector-dropdown-label-text">Commuta la taula de continguts.</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-titlebar-toc-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">Longitud d'ona</span></h1> <div id="p-lang-btn" class="vector-dropdown mw-portlet mw-portlet-lang" > <input type="checkbox" id="p-lang-btn-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-p-lang-btn" class="vector-dropdown-checkbox mw-interlanguage-selector" aria-label="Vés a un article en una altra llengua. Disponible en 98 llengües" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-98" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">98 llengües</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-af mw-list-item"><a href="https://af.wikipedia.org/wiki/Golflengte" title="Golflengte - afrikaans" lang="af" hreflang="af" data-title="Golflengte" data-language-autonym="Afrikaans" data-language-local-name="afrikaans" class="interlanguage-link-target"><span>Afrikaans</span></a></li><li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D8%B7%D9%88%D9%84_%D8%A7%D9%84%D9%85%D9%88%D8%AC%D8%A9" title="طول الموجة - àrab" lang="ar" hreflang="ar" data-title="طول الموجة" data-language-autonym="العربية" data-language-local-name="àrab" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-ary mw-list-item"><a href="https://ary.wikipedia.org/wiki/%D8%B7%D9%88%D9%84_%D9%85%D9%88%D8%AC%D9%8A" title="طول موجي - Moroccan Arabic" lang="ary" hreflang="ary" data-title="طول موجي" data-language-autonym="الدارجة" data-language-local-name="Moroccan Arabic" class="interlanguage-link-target"><span>الدارجة</span></a></li><li class="interlanguage-link interwiki-ast mw-list-item"><a href="https://ast.wikipedia.org/wiki/Llonxit%C3%BA_d%27onda" title="Llonxitú d'onda - asturià" lang="ast" hreflang="ast" data-title="Llonxitú d'onda" data-language-autonym="Asturianu" data-language-local-name="asturià" class="interlanguage-link-target"><span>Asturianu</span></a></li><li class="interlanguage-link interwiki-az mw-list-item"><a href="https://az.wikipedia.org/wiki/Dal%C4%9Fa_uzunlu%C4%9Fu" title="Dalğa uzunluğu - azerbaidjanès" lang="az" hreflang="az" data-title="Dalğa uzunluğu" data-language-autonym="Azərbaycanca" data-language-local-name="azerbaidjanès" class="interlanguage-link-target"><span>Azərbaycanca</span></a></li><li class="interlanguage-link interwiki-azb mw-list-item"><a href="https://azb.wikipedia.org/wiki/%D8%AF%D8%A7%D9%84%D8%BA%D8%A7_%D8%A8%D9%88%DB%8C%D9%88" title="دالغا بویو - South Azerbaijani" lang="azb" hreflang="azb" data-title="دالغا بویو" data-language-autonym="تۆرکجه" data-language-local-name="South Azerbaijani" class="interlanguage-link-target"><span>تۆرکجه</span></a></li><li class="interlanguage-link interwiki-bar mw-list-item"><a href="https://bar.wikipedia.org/wiki/W%C3%B6%C3%B6nl%C3%A4ng" title="Wöönläng - bavarès" lang="bar" hreflang="bar" data-title="Wöönläng" data-language-autonym="Boarisch" data-language-local-name="bavarès" class="interlanguage-link-target"><span>Boarisch</span></a></li><li class="interlanguage-link interwiki-be mw-list-item"><a href="https://be.wikipedia.org/wiki/%D0%94%D0%B0%D1%9E%D0%B6%D1%8B%D0%BD%D1%8F_%D1%85%D0%B2%D0%B0%D0%BB%D1%96" title="Даўжыня хвалі - belarús" lang="be" hreflang="be" data-title="Даўжыня хвалі" data-language-autonym="Беларуская" data-language-local-name="belarús" class="interlanguage-link-target"><span>Беларуская</span></a></li><li class="interlanguage-link interwiki-be-x-old mw-list-item"><a href="https://be-tarask.wikipedia.org/wiki/%D0%94%D0%B0%D1%9E%D0%B6%D1%8B%D0%BD%D1%8F_%D1%85%D0%B2%D0%B0%D0%BB%D1%96" title="Даўжыня хвалі - Belarusian (Taraškievica orthography)" lang="be-tarask" hreflang="be-tarask" data-title="Даўжыня хвалі" data-language-autonym="Беларуская (тарашкевіца)" data-language-local-name="Belarusian (Taraškievica orthography)" class="interlanguage-link-target"><span>Беларуская (тарашкевіца)</span></a></li><li class="interlanguage-link interwiki-bg mw-list-item"><a href="https://bg.wikipedia.org/wiki/%D0%94%D1%8A%D0%BB%D0%B6%D0%B8%D0%BD%D0%B0_%D0%BD%D0%B0_%D0%B2%D1%8A%D0%BB%D0%BD%D0%B0%D1%82%D0%B0" title="Дължина на вълната - búlgar" lang="bg" hreflang="bg" data-title="Дължина на вълната" data-language-autonym="Български" data-language-local-name="búlgar" class="interlanguage-link-target"><span>Български</span></a></li><li class="interlanguage-link interwiki-bn mw-list-item"><a href="https://bn.wikipedia.org/wiki/%E0%A6%A4%E0%A6%B0%E0%A6%99%E0%A7%8D%E0%A6%97_%E0%A6%A6%E0%A7%88%E0%A6%B0%E0%A7%8D%E0%A6%98%E0%A7%8D%E0%A6%AF" title="তরঙ্গ দৈর্ঘ্য - bengalí" lang="bn" hreflang="bn" data-title="তরঙ্গ দৈর্ঘ্য" data-language-autonym="বাংলা" data-language-local-name="bengalí" class="interlanguage-link-target"><span>বাংলা</span></a></li><li class="interlanguage-link interwiki-br mw-list-item"><a href="https://br.wikipedia.org/wiki/Hirder_gwagenn" title="Hirder gwagenn - bretó" lang="br" hreflang="br" data-title="Hirder gwagenn" data-language-autonym="Brezhoneg" data-language-local-name="bretó" class="interlanguage-link-target"><span>Brezhoneg</span></a></li><li class="interlanguage-link interwiki-bs mw-list-item"><a href="https://bs.wikipedia.org/wiki/Talasna_du%C5%BEina" title="Talasna dužina - bosnià" lang="bs" hreflang="bs" data-title="Talasna dužina" data-language-autonym="Bosanski" data-language-local-name="bosnià" class="interlanguage-link-target"><span>Bosanski</span></a></li><li class="interlanguage-link interwiki-ckb mw-list-item"><a href="https://ckb.wikipedia.org/wiki/%D8%AF%D8%B1%DB%8E%DA%98%DB%8C%DB%8C_%D8%B4%DB%95%D9%BE%DB%86%D9%84" title="درێژیی شەپۆل - kurd central" lang="ckb" hreflang="ckb" data-title="درێژیی شەپۆل" data-language-autonym="کوردی" data-language-local-name="kurd central" class="interlanguage-link-target"><span>کوردی</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/Vlnov%C3%A1_d%C3%A9lka" title="Vlnová délka - txec" lang="cs" hreflang="cs" data-title="Vlnová délka" data-language-autonym="Čeština" data-language-local-name="txec" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-cy mw-list-item"><a href="https://cy.wikipedia.org/wiki/Tonfedd" title="Tonfedd - gal·lès" lang="cy" hreflang="cy" data-title="Tonfedd" data-language-autonym="Cymraeg" data-language-local-name="gal·lès" class="interlanguage-link-target"><span>Cymraeg</span></a></li><li class="interlanguage-link interwiki-da mw-list-item"><a href="https://da.wikipedia.org/wiki/B%C3%B8lgel%C3%A6ngde" title="Bølgelængde - danès" lang="da" hreflang="da" data-title="Bølgelængde" data-language-autonym="Dansk" data-language-local-name="danès" class="interlanguage-link-target"><span>Dansk</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Wellenl%C3%A4nge" title="Wellenlänge - alemany" lang="de" hreflang="de" data-title="Wellenlänge" data-language-autonym="Deutsch" data-language-local-name="alemany" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-el mw-list-item"><a href="https://el.wikipedia.org/wiki/%CE%9C%CE%AE%CE%BA%CE%BF%CF%82_%CE%BA%CF%8D%CE%BC%CE%B1%CF%84%CE%BF%CF%82" title="Μήκος κύματος - grec" lang="el" hreflang="el" data-title="Μήκος κύματος" data-language-autonym="Ελληνικά" data-language-local-name="grec" class="interlanguage-link-target"><span>Ελληνικά</span></a></li><li class="interlanguage-link interwiki-en mw-list-item"><a href="https://en.wikipedia.org/wiki/Wavelength" title="Wavelength - anglès" lang="en" hreflang="en" data-title="Wavelength" data-language-autonym="English" data-language-local-name="anglès" class="interlanguage-link-target"><span>English</span></a></li><li class="interlanguage-link interwiki-eo mw-list-item"><a href="https://eo.wikipedia.org/wiki/Ondolongo" title="Ondolongo - esperanto" lang="eo" hreflang="eo" data-title="Ondolongo" data-language-autonym="Esperanto" data-language-local-name="esperanto" class="interlanguage-link-target"><span>Esperanto</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Longitud_de_onda" title="Longitud de onda - espanyol" lang="es" hreflang="es" data-title="Longitud de onda" data-language-autonym="Español" data-language-local-name="espanyol" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-et mw-list-item"><a href="https://et.wikipedia.org/wiki/Lainepikkus" title="Lainepikkus - estonià" lang="et" hreflang="et" data-title="Lainepikkus" data-language-autonym="Eesti" data-language-local-name="estonià" class="interlanguage-link-target"><span>Eesti</span></a></li><li class="interlanguage-link interwiki-eu mw-list-item"><a href="https://eu.wikipedia.org/wiki/Uhin-luzera" title="Uhin-luzera - basc" lang="eu" hreflang="eu" data-title="Uhin-luzera" data-language-autonym="Euskara" data-language-local-name="basc" class="interlanguage-link-target"><span>Euskara</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D8%B7%D9%88%D9%84_%D9%85%D9%88%D8%AC" title="طول موج - persa" lang="fa" hreflang="fa" data-title="طول موج" data-language-autonym="فارسی" data-language-local-name="persa" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fi mw-list-item"><a href="https://fi.wikipedia.org/wiki/Aallonpituus" title="Aallonpituus - finès" lang="fi" hreflang="fi" data-title="Aallonpituus" data-language-autonym="Suomi" data-language-local-name="finès" class="interlanguage-link-target"><span>Suomi</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Longueur_d%27onde" title="Longueur d'onde - francès" lang="fr" hreflang="fr" data-title="Longueur d'onde" data-language-autonym="Français" data-language-local-name="francès" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-frr mw-list-item"><a href="https://frr.wikipedia.org/wiki/Waagenlengde" title="Waagenlengde - frisó septentrional" lang="frr" hreflang="frr" data-title="Waagenlengde" data-language-autonym="Nordfriisk" data-language-local-name="frisó septentrional" class="interlanguage-link-target"><span>Nordfriisk</span></a></li><li class="interlanguage-link interwiki-fy mw-list-item"><a href="https://fy.wikipedia.org/wiki/Weachlingte" title="Weachlingte - frisó occidental" lang="fy" hreflang="fy" data-title="Weachlingte" data-language-autonym="Frysk" data-language-local-name="frisó occidental" class="interlanguage-link-target"><span>Frysk</span></a></li><li class="interlanguage-link interwiki-ga mw-list-item"><a href="https://ga.wikipedia.org/wiki/Tonnfhad" title="Tonnfhad - irlandès" lang="ga" hreflang="ga" data-title="Tonnfhad" data-language-autonym="Gaeilge" data-language-local-name="irlandès" class="interlanguage-link-target"><span>Gaeilge</span></a></li><li class="interlanguage-link interwiki-gd mw-list-item"><a href="https://gd.wikipedia.org/wiki/Tonn-fhad" title="Tonn-fhad - gaèlic escocès" lang="gd" hreflang="gd" data-title="Tonn-fhad" data-language-autonym="Gàidhlig" data-language-local-name="gaèlic escocès" class="interlanguage-link-target"><span>Gàidhlig</span></a></li><li class="interlanguage-link interwiki-gl mw-list-item"><a href="https://gl.wikipedia.org/wiki/Lonxitude_de_onda" title="Lonxitude de onda - gallec" lang="gl" hreflang="gl" data-title="Lonxitude de onda" data-language-autonym="Galego" data-language-local-name="gallec" class="interlanguage-link-target"><span>Galego</span></a></li><li class="interlanguage-link interwiki-gu mw-list-item"><a href="https://gu.wikipedia.org/wiki/%E0%AA%A4%E0%AA%B0%E0%AA%82%E0%AA%97%E0%AA%B2%E0%AA%82%E0%AA%AC%E0%AA%BE%E0%AA%88" title="તરંગલંબાઈ - gujarati" lang="gu" hreflang="gu" data-title="તરંગલંબાઈ" data-language-autonym="ગુજરાતી" data-language-local-name="gujarati" class="interlanguage-link-target"><span>ગુજરાતી</span></a></li><li class="interlanguage-link interwiki-he mw-list-item"><a href="https://he.wikipedia.org/wiki/%D7%90%D7%95%D7%A8%D7%9A_%D7%92%D7%9C" title="אורך גל - hebreu" lang="he" hreflang="he" data-title="אורך גל" data-language-autonym="עברית" data-language-local-name="hebreu" class="interlanguage-link-target"><span>עברית</span></a></li><li class="interlanguage-link interwiki-hi mw-list-item"><a href="https://hi.wikipedia.org/wiki/%E0%A4%A4%E0%A4%B0%E0%A4%82%E0%A4%97%E0%A4%A6%E0%A5%88%E0%A4%B0%E0%A5%8D%E0%A4%98%E0%A5%8D%E0%A4%AF" title="तरंगदैर्घ्य - hindi" lang="hi" hreflang="hi" data-title="तरंगदैर्घ्य" data-language-autonym="हिन्दी" data-language-local-name="hindi" class="interlanguage-link-target"><span>हिन्दी</span></a></li><li class="interlanguage-link interwiki-hr mw-list-item"><a href="https://hr.wikipedia.org/wiki/Valna_duljina" title="Valna duljina - croat" lang="hr" hreflang="hr" data-title="Valna duljina" data-language-autonym="Hrvatski" data-language-local-name="croat" class="interlanguage-link-target"><span>Hrvatski</span></a></li><li class="interlanguage-link interwiki-ht mw-list-item"><a href="https://ht.wikipedia.org/wiki/Long%C3%A8donn" title="Longèdonn - crioll d’Haití" lang="ht" hreflang="ht" data-title="Longèdonn" data-language-autonym="Kreyòl ayisyen" data-language-local-name="crioll d’Haití" class="interlanguage-link-target"><span>Kreyòl ayisyen</span></a></li><li class="interlanguage-link interwiki-hu mw-list-item"><a href="https://hu.wikipedia.org/wiki/Hull%C3%A1mhossz" title="Hullámhossz - hongarès" lang="hu" hreflang="hu" data-title="Hullámhossz" data-language-autonym="Magyar" data-language-local-name="hongarès" class="interlanguage-link-target"><span>Magyar</span></a></li><li class="interlanguage-link interwiki-hy mw-list-item"><a href="https://hy.wikipedia.org/wiki/%D4%B1%D5%AC%D5%AB%D6%84%D5%AB_%D5%A5%D6%80%D5%AF%D5%A1%D6%80%D5%B8%D6%82%D5%A9%D5%B5%D5%B8%D6%82%D5%B6" title="Ալիքի երկարություն - armeni" lang="hy" hreflang="hy" data-title="Ալիքի երկարություն" data-language-autonym="Հայերեն" data-language-local-name="armeni" class="interlanguage-link-target"><span>Հայերեն</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Panjang_gelombang" title="Panjang gelombang - indonesi" lang="id" hreflang="id" data-title="Panjang gelombang" data-language-autonym="Bahasa Indonesia" data-language-local-name="indonesi" class="interlanguage-link-target"><span>Bahasa Indonesia</span></a></li><li class="interlanguage-link interwiki-is mw-list-item"><a href="https://is.wikipedia.org/wiki/Bylgjulengd" title="Bylgjulengd - islandès" lang="is" hreflang="is" data-title="Bylgjulengd" data-language-autonym="Íslenska" data-language-local-name="islandès" class="interlanguage-link-target"><span>Íslenska</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/Lunghezza_d%27onda" title="Lunghezza d'onda - italià" lang="it" hreflang="it" data-title="Lunghezza d'onda" data-language-autonym="Italiano" data-language-local-name="italià" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%E6%B3%A2%E9%95%B7" title="波長 - japonès" lang="ja" hreflang="ja" data-title="波長" data-language-autonym="日本語" data-language-local-name="japonès" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-ka mw-list-item"><a href="https://ka.wikipedia.org/wiki/%E1%83%A2%E1%83%90%E1%83%9A%E1%83%A6%E1%83%98%E1%83%A1_%E1%83%A1%E1%83%98%E1%83%92%E1%83%A0%E1%83%AB%E1%83%94" title="ტალღის სიგრძე - georgià" lang="ka" hreflang="ka" data-title="ტალღის სიგრძე" data-language-autonym="ქართული" data-language-local-name="georgià" class="interlanguage-link-target"><span>ქართული</span></a></li><li class="interlanguage-link interwiki-kk mw-list-item"><a href="https://kk.wikipedia.org/wiki/%D0%A2%D0%BE%D0%BB%D2%9B%D1%8B%D0%BD_%D2%B1%D0%B7%D1%8B%D0%BD%D0%B4%D1%8B%D2%93%D1%8B" title="Толқын ұзындығы - kazakh" lang="kk" hreflang="kk" data-title="Толқын ұзындығы" data-language-autonym="Қазақша" data-language-local-name="kazakh" class="interlanguage-link-target"><span>Қазақша</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%ED%8C%8C%EC%9E%A5" title="파장 - coreà" lang="ko" hreflang="ko" data-title="파장" data-language-autonym="한국어" data-language-local-name="coreà" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-ku mw-list-item"><a href="https://ku.wikipedia.org/wiki/P%C3%AAldir%C3%AAjah%C3%AE" title="Pêldirêjahî - kurd" lang="ku" hreflang="ku" data-title="Pêldirêjahî" data-language-autonym="Kurdî" data-language-local-name="kurd" class="interlanguage-link-target"><span>Kurdî</span></a></li><li class="interlanguage-link interwiki-ky mw-list-item"><a href="https://ky.wikipedia.org/wiki/%D0%A2%D0%BE%D0%BB%D0%BA%D1%83%D0%BD_%D1%83%D0%B7%D1%83%D0%BD%D0%B4%D1%83%D0%B3%D1%83" title="Толкун узундугу - kirguís" lang="ky" hreflang="ky" data-title="Толкун узундугу" data-language-autonym="Кыргызча" data-language-local-name="kirguís" class="interlanguage-link-target"><span>Кыргызча</span></a></li><li class="interlanguage-link interwiki-la mw-list-item"><a href="https://la.wikipedia.org/wiki/Longitudo_undae" title="Longitudo undae - llatí" lang="la" hreflang="la" data-title="Longitudo undae" data-language-autonym="Latina" data-language-local-name="llatí" class="interlanguage-link-target"><span>Latina</span></a></li><li class="interlanguage-link interwiki-lb mw-list-item"><a href="https://lb.wikipedia.org/wiki/Wellel%C3%A4ngt" title="Wellelängt - luxemburguès" lang="lb" hreflang="lb" data-title="Wellelängt" data-language-autonym="Lëtzebuergesch" data-language-local-name="luxemburguès" class="interlanguage-link-target"><span>Lëtzebuergesch</span></a></li><li class="interlanguage-link interwiki-lt mw-list-item"><a href="https://lt.wikipedia.org/wiki/Bangos_ilgis" title="Bangos ilgis - lituà" lang="lt" hreflang="lt" data-title="Bangos ilgis" data-language-autonym="Lietuvių" data-language-local-name="lituà" class="interlanguage-link-target"><span>Lietuvių</span></a></li><li class="interlanguage-link interwiki-lv mw-list-item"><a href="https://lv.wikipedia.org/wiki/Vi%C4%BC%C5%86a_garums" title="Viļņa garums - letó" lang="lv" hreflang="lv" data-title="Viļņa garums" data-language-autonym="Latviešu" data-language-local-name="letó" class="interlanguage-link-target"><span>Latviešu</span></a></li><li class="interlanguage-link interwiki-mk mw-list-item"><a href="https://mk.wikipedia.org/wiki/%D0%91%D1%80%D0%B0%D0%BD%D0%BE%D0%B2%D0%B0_%D0%B4%D0%BE%D0%BB%D0%B6%D0%B8%D0%BD%D0%B0" title="Бранова должина - macedoni" lang="mk" hreflang="mk" data-title="Бранова должина" data-language-autonym="Македонски" data-language-local-name="macedoni" class="interlanguage-link-target"><span>Македонски</span></a></li><li class="interlanguage-link interwiki-ml mw-list-item"><a href="https://ml.wikipedia.org/wiki/%E0%B4%A4%E0%B4%B0%E0%B4%82%E0%B4%97%E0%B4%A6%E0%B5%88%E0%B5%BC%E0%B4%98%E0%B5%8D%E0%B4%AF%E0%B4%82" title="തരംഗദൈർഘ്യം - malaiàlam" lang="ml" hreflang="ml" data-title="തരംഗദൈർഘ്യം" data-language-autonym="മലയാളം" data-language-local-name="malaiàlam" class="interlanguage-link-target"><span>മലയാളം</span></a></li><li class="interlanguage-link interwiki-mn mw-list-item"><a href="https://mn.wikipedia.org/wiki/%D0%94%D0%BE%D0%BB%D0%B3%D0%B8%D0%BE%D0%BD%D1%8B_%D1%83%D1%80%D1%82" title="Долгионы урт - mongol" lang="mn" hreflang="mn" data-title="Долгионы урт" data-language-autonym="Монгол" data-language-local-name="mongol" class="interlanguage-link-target"><span>Монгол</span></a></li><li class="interlanguage-link interwiki-mr mw-list-item"><a href="https://mr.wikipedia.org/wiki/%E0%A4%A4%E0%A4%B0%E0%A4%82%E0%A4%97%E0%A4%B2%E0%A4%BE%E0%A4%82%E0%A4%AC%E0%A5%80" title="तरंगलांबी - marathi" lang="mr" hreflang="mr" data-title="तरंगलांबी" data-language-autonym="मराठी" data-language-local-name="marathi" class="interlanguage-link-target"><span>मराठी</span></a></li><li class="interlanguage-link interwiki-ms mw-list-item"><a href="https://ms.wikipedia.org/wiki/Panjang_gelombang" title="Panjang gelombang - malai" lang="ms" hreflang="ms" data-title="Panjang gelombang" data-language-autonym="Bahasa Melayu" data-language-local-name="malai" class="interlanguage-link-target"><span>Bahasa Melayu</span></a></li><li class="interlanguage-link interwiki-nds mw-list-item"><a href="https://nds.wikipedia.org/wiki/B%C3%BClgenl%C3%A4ng" title="Bülgenläng - baix alemany" lang="nds" hreflang="nds" data-title="Bülgenläng" data-language-autonym="Plattdüütsch" data-language-local-name="baix alemany" class="interlanguage-link-target"><span>Plattdüütsch</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Golflengte" title="Golflengte - neerlandès" lang="nl" hreflang="nl" data-title="Golflengte" data-language-autonym="Nederlands" data-language-local-name="neerlandès" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-nn mw-list-item"><a href="https://nn.wikipedia.org/wiki/B%C3%B8lgjelengd" title="Bølgjelengd - noruec nynorsk" lang="nn" hreflang="nn" data-title="Bølgjelengd" data-language-autonym="Norsk nynorsk" data-language-local-name="noruec nynorsk" class="interlanguage-link-target"><span>Norsk nynorsk</span></a></li><li class="interlanguage-link interwiki-no mw-list-item"><a href="https://no.wikipedia.org/wiki/B%C3%B8lgelengde" title="Bølgelengde - noruec bokmål" lang="nb" hreflang="nb" data-title="Bølgelengde" data-language-autonym="Norsk bokmål" data-language-local-name="noruec bokmål" class="interlanguage-link-target"><span>Norsk bokmål</span></a></li><li class="interlanguage-link interwiki-oc mw-list-item"><a href="https://oc.wikipedia.org/wiki/Longor_d%27onda" title="Longor d'onda - occità" lang="oc" hreflang="oc" data-title="Longor d'onda" data-language-autonym="Occitan" data-language-local-name="occità" class="interlanguage-link-target"><span>Occitan</span></a></li><li class="interlanguage-link interwiki-om mw-list-item"><a href="https://om.wikipedia.org/wiki/Dambalii" title="Dambalii - oromo" lang="om" hreflang="om" data-title="Dambalii" data-language-autonym="Oromoo" data-language-local-name="oromo" class="interlanguage-link-target"><span>Oromoo</span></a></li><li class="interlanguage-link interwiki-pa mw-list-item"><a href="https://pa.wikipedia.org/wiki/%E0%A8%9B%E0%A9%B1%E0%A8%B2-%E0%A8%B2%E0%A9%B0%E0%A8%AC%E0%A8%BE%E0%A8%88" title="ਛੱਲ-ਲੰਬਾਈ - panjabi" lang="pa" hreflang="pa" data-title="ਛੱਲ-ਲੰਬਾਈ" data-language-autonym="ਪੰਜਾਬੀ" data-language-local-name="panjabi" class="interlanguage-link-target"><span>ਪੰਜਾਬੀ</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/D%C5%82ugo%C5%9B%C4%87_fali" title="Długość fali - polonès" lang="pl" hreflang="pl" data-title="Długość fali" data-language-autonym="Polski" data-language-local-name="polonès" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-pnb mw-list-item"><a href="https://pnb.wikipedia.org/wiki/%D9%84%DB%81%D8%B1_%D9%84%D9%85%D8%A8%D8%A7%D8%A6%DB%8C" title="لہر لمبائی - Western Punjabi" lang="pnb" hreflang="pnb" data-title="لہر لمبائی" data-language-autonym="پنجابی" data-language-local-name="Western Punjabi" class="interlanguage-link-target"><span>پنجابی</span></a></li><li class="interlanguage-link interwiki-ps mw-list-item"><a href="https://ps.wikipedia.org/wiki/%DA%85%D9%BE%D9%88%D8%A7%D9%BC%D9%86" title="څپواټن - paixtu" lang="ps" hreflang="ps" data-title="څپواټن" data-language-autonym="پښتو" data-language-local-name="paixtu" class="interlanguage-link-target"><span>پښتو</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/Comprimento_de_onda" title="Comprimento de onda - portuguès" lang="pt" hreflang="pt" data-title="Comprimento de onda" data-language-autonym="Português" data-language-local-name="portuguès" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-ro mw-list-item"><a href="https://ro.wikipedia.org/wiki/Lungime_de_und%C4%83" title="Lungime de undă - romanès" lang="ro" hreflang="ro" data-title="Lungime de undă" data-language-autonym="Română" data-language-local-name="romanès" class="interlanguage-link-target"><span>Română</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/%D0%94%D0%BB%D0%B8%D0%BD%D0%B0_%D0%B2%D0%BE%D0%BB%D0%BD%D1%8B" title="Длина волны - rus" lang="ru" hreflang="ru" data-title="Длина волны" data-language-autonym="Русский" data-language-local-name="rus" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-rue mw-list-item"><a href="https://rue.wikipedia.org/wiki/%D0%92%D0%BE%D0%B2%D0%BD%D0%BE%D0%B2%D0%B0_%D0%B4%D0%BE%D0%B2%D0%B6%D0%BA%D0%B0" title="Вовнова довжка - Rusyn" lang="rue" hreflang="rue" data-title="Вовнова довжка" data-language-autonym="Русиньскый" data-language-local-name="Rusyn" class="interlanguage-link-target"><span>Русиньскый</span></a></li><li class="interlanguage-link interwiki-sh mw-list-item"><a href="https://sh.wikipedia.org/wiki/Valna_du%C5%BEina" title="Valna dužina - serbocroat" lang="sh" hreflang="sh" data-title="Valna dužina" data-language-autonym="Srpskohrvatski / српскохрватски" data-language-local-name="serbocroat" class="interlanguage-link-target"><span>Srpskohrvatski / српскохрватски</span></a></li><li class="interlanguage-link interwiki-si mw-list-item"><a href="https://si.wikipedia.org/wiki/%E0%B6%AD%E0%B6%BB%E0%B6%82%E0%B6%9C_%E0%B6%86%E0%B6%BA%E0%B7%8F%E0%B6%B8%E0%B6%BA" title="තරංග ආයාමය - singalès" lang="si" hreflang="si" data-title="තරංග ආයාමය" data-language-autonym="සිංහල" data-language-local-name="singalès" class="interlanguage-link-target"><span>සිංහල</span></a></li><li class="interlanguage-link interwiki-simple mw-list-item"><a href="https://simple.wikipedia.org/wiki/Wavelength" title="Wavelength - Simple English" lang="en-simple" hreflang="en-simple" data-title="Wavelength" data-language-autonym="Simple English" data-language-local-name="Simple English" class="interlanguage-link-target"><span>Simple English</span></a></li><li class="interlanguage-link interwiki-sk mw-list-item"><a href="https://sk.wikipedia.org/wiki/Vlnov%C3%A1_d%C4%BA%C5%BEka" title="Vlnová dĺžka - eslovac" lang="sk" hreflang="sk" data-title="Vlnová dĺžka" data-language-autonym="Slovenčina" data-language-local-name="eslovac" class="interlanguage-link-target"><span>Slovenčina</span></a></li><li class="interlanguage-link interwiki-sl mw-list-item"><a href="https://sl.wikipedia.org/wiki/Valovna_dol%C5%BEina" title="Valovna dolžina - eslovè" lang="sl" hreflang="sl" data-title="Valovna dolžina" data-language-autonym="Slovenščina" data-language-local-name="eslovè" class="interlanguage-link-target"><span>Slovenščina</span></a></li><li class="interlanguage-link interwiki-so mw-list-item"><a href="https://so.wikipedia.org/wiki/Dhererka_Mowjadda" title="Dhererka Mowjadda - somali" lang="so" hreflang="so" data-title="Dhererka Mowjadda" data-language-autonym="Soomaaliga" data-language-local-name="somali" class="interlanguage-link-target"><span>Soomaaliga</span></a></li><li class="interlanguage-link interwiki-sq mw-list-item"><a href="https://sq.wikipedia.org/wiki/Gjat%C3%ABsia_e_val%C3%ABs" title="Gjatësia e valës - albanès" lang="sq" hreflang="sq" data-title="Gjatësia e valës" data-language-autonym="Shqip" data-language-local-name="albanès" class="interlanguage-link-target"><span>Shqip</span></a></li><li class="interlanguage-link interwiki-sr mw-list-item"><a href="https://sr.wikipedia.org/wiki/%D0%A2%D0%B0%D0%BB%D0%B0%D1%81%D0%BD%D0%B0_%D0%B4%D1%83%D0%B6%D0%B8%D0%BD%D0%B0" title="Таласна дужина - serbi" lang="sr" hreflang="sr" data-title="Таласна дужина" data-language-autonym="Српски / srpski" data-language-local-name="serbi" class="interlanguage-link-target"><span>Српски / srpski</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/V%C3%A5gl%C3%A4ngd" title="Våglängd - suec" lang="sv" hreflang="sv" data-title="Våglängd" data-language-autonym="Svenska" data-language-local-name="suec" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-sw mw-list-item"><a href="https://sw.wikipedia.org/wiki/Masafa_ya_mawimbi" title="Masafa ya mawimbi - suahili" lang="sw" hreflang="sw" data-title="Masafa ya mawimbi" data-language-autonym="Kiswahili" data-language-local-name="suahili" class="interlanguage-link-target"><span>Kiswahili</span></a></li><li class="interlanguage-link interwiki-ta mw-list-item"><a href="https://ta.wikipedia.org/wiki/%E0%AE%85%E0%AE%B2%E0%AF%88%E0%AE%A8%E0%AF%80%E0%AE%B3%E0%AE%AE%E0%AF%8D" title="அலைநீளம் - tàmil" lang="ta" hreflang="ta" data-title="அலைநீளம்" data-language-autonym="தமிழ்" data-language-local-name="tàmil" class="interlanguage-link-target"><span>தமிழ்</span></a></li><li class="interlanguage-link interwiki-te mw-list-item"><a href="https://te.wikipedia.org/wiki/%E0%B0%A4%E0%B0%B0%E0%B0%82%E0%B0%97_%E0%B0%A6%E0%B1%88%E0%B0%B0%E0%B1%8D%E0%B0%98%E0%B1%8D%E0%B0%AF%E0%B0%82" title="తరంగ దైర్ఘ్యం - telugu" lang="te" hreflang="te" data-title="తరంగ దైర్ఘ్యం" data-language-autonym="తెలుగు" data-language-local-name="telugu" class="interlanguage-link-target"><span>తెలుగు</span></a></li><li class="interlanguage-link interwiki-tg mw-list-item"><a href="https://tg.wikipedia.org/wiki/%D0%90%D0%B4%D0%B0%D0%B4%D0%B8_%D0%BC%D0%B0%D0%B2%D2%B7%D3%A3" title="Адади мавҷӣ - tadjik" lang="tg" hreflang="tg" data-title="Адади мавҷӣ" data-language-autonym="Тоҷикӣ" data-language-local-name="tadjik" class="interlanguage-link-target"><span>Тоҷикӣ</span></a></li><li class="interlanguage-link interwiki-th mw-list-item"><a href="https://th.wikipedia.org/wiki/%E0%B8%84%E0%B8%A7%E0%B8%B2%E0%B8%A1%E0%B8%A2%E0%B8%B2%E0%B8%A7%E0%B8%84%E0%B8%A5%E0%B8%B7%E0%B9%88%E0%B8%99" title="ความยาวคลื่น - tai" lang="th" hreflang="th" data-title="ความยาวคลื่น" data-language-autonym="ไทย" data-language-local-name="tai" class="interlanguage-link-target"><span>ไทย</span></a></li><li class="interlanguage-link interwiki-tl mw-list-item"><a href="https://tl.wikipedia.org/wiki/Alonghaba" title="Alonghaba - tagal" lang="tl" hreflang="tl" data-title="Alonghaba" data-language-autonym="Tagalog" data-language-local-name="tagal" class="interlanguage-link-target"><span>Tagalog</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/Dalga_boyu" title="Dalga boyu - turc" lang="tr" hreflang="tr" data-title="Dalga boyu" data-language-autonym="Türkçe" data-language-local-name="turc" class="interlanguage-link-target"><span>Türkçe</span></a></li><li class="interlanguage-link interwiki-tt mw-list-item"><a href="https://tt.wikipedia.org/wiki/%D0%94%D1%83%D0%BB%D0%BA%D1%8B%D0%BD_%D0%BE%D0%B7%D1%8B%D0%BD%D0%BB%D1%8B%D0%B3%D1%8B" title="Дулкын озынлыгы - tàtar" lang="tt" hreflang="tt" 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dir="ltr"><figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/Fitxer:Wellenlaenge.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/7/7a/Wellenlaenge.png/220px-Wellenlaenge.png" decoding="async" width="220" height="191" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/7a/Wellenlaenge.png/330px-Wellenlaenge.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/7a/Wellenlaenge.png/440px-Wellenlaenge.png 2x" data-file-width="600" data-file-height="520" /></a><figcaption>Aquesta imatge mostra la mesura de la longitud d'ona entre dos punts d'equilibri i l'equivalent sobre dues crestes consecutives.</figcaption></figure> <p>La <b>longitud d'ona</b> és la <a href="/wiki/Magnitud_f%C3%ADsica" title="Magnitud física">magnitud física</a> que indica la <a href="/wiki/Dist%C3%A0ncia" title="Distància">distància</a> entre el principi i el final d'una <a href="/wiki/Ona" title="Ona">ona</a> completa (cicle). Així, la <a href="/wiki/Longitud" title="Longitud">longitud</a> d'ona es defineix com la separació espacial existent entre dos punts l'estat de <a href="/wiki/Moviment" title="Moviment">moviment</a> de la qual és idèntic.<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> És a dir, entre dos màxims consecutius d'alguna propietat física de l'ona. </p><p>En el cas de les ones electromagnètiques, aquesta propietat física potser l'efecte magnètic (camp magnètic) que també varia en el temps. Una altra pot ser, per exemple, el seu efecte elèctric (camp elèctric) el qual, segons avança l'ona, augmenta fins a un màxim, disminueix fins a anul·lar-se, canvia de signe per fer-se negativa arribant a un mínim (màxim negatiu). Després, augmenta fins a anul·lar-se, canvia de signe i es fa de nou màxim (positiu). Aquesta variació de l'efecte electrònic en el temps, si la representem en un paper, obtenim "crestes" i valls" (obtenim una corba sinusoidal). </p><p>Assumint una ona sinusoidal movent-se a una velocitat fixa, la longitud d'ona és inversament proporcional a la freqüència de l'ona: les ones amb major freqüència tenen longitud d'ones menors, i viceversa. La longitud també depèn del medi pel qual viatja l'ona (buit, aigua, aire). </p><p>Cal recalcar que la longitud d'ona no és la distància que recorren les partícules implicades en la propagació de l'ona (molècules d'aigua en les onades del mar, àtoms o molècules de la superfície terrestre en un terratrèmol, molècules de l'atmosfera terrestre propagant un so, etc.). Sinó que és la distància que recorre l'ona. </p><p>La longitud d'ona, tradicionalment, es representa amb la lletra grega λ (<a href="/wiki/Lambda" title="Lambda">lambda</a>). </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Unitats">Unitats</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Longitud_d%27ona&action=edit&section=1" title="Modifica la secció: Unitats"><span>modifica</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>La unitat per mesurar la longitud d'ona al <a href="/wiki/Sistema_Internacional_d%27Unitats" title="Sistema Internacional d'Unitats">Sistema Internacional d'Unitats</a> és el <a href="/wiki/Metre" title="Metre">metre</a> i els seus submúltiples, com el <a href="/wiki/Nan%C3%B2metre" title="Nanòmetre">nanòmetre</a> o el <a href="/wiki/Micr%C3%B2metre_(unitat)" class="mw-redirect" title="Micròmetre (unitat)">micròmetre</a>. Per exemple, la longitud d'ona de les <a href="/wiki/Ones_sonores" class="mw-redirect" title="Ones sonores">ones sonores</a> es pot mesurar en metres mentre que els <a href="/wiki/Nan%C3%B2metre" title="Nanòmetre">nanòmetres</a> són més còmodes per a les longituds d'<a href="/wiki/Ona" title="Ona">ona</a> de <a href="/wiki/Radiaci%C3%B3_electromagn%C3%A8tica" title="Radiació electromagnètica">radiacions electromagnètiques</a>, com la <a href="/wiki/Radiaci%C3%B3_ultraviolada" class="mw-redirect" title="Radiació ultraviolada">radiació ultraviolada</a> i els <a href="/wiki/Raig_gamma" class="mw-redirect" title="Raig gamma">raigs gamma</a>. </p> <ul><li>Un nanòmetre = 1 nm = 10<sup>-9</sup> m</li> <li>Un micròmetre = 1 µm = 10<sup>-6</sup> m</li></ul> <p>Fora del Sistema Internacional, s'usa per exemple l'<a href="/wiki/%C3%80ngstrom" title="Àngstrom">àngstrom</a>, especialment en <a href="/wiki/Espectrosc%C3%B2pia" title="Espectroscòpia">espectroscòpia</a>,<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> per tradició i comoditat, ja que la distància típica entre àtoms de molts cristalls és de l'ordre d'àngstroms. </p> <dl><dd>1 <a href="/wiki/Angstrom" class="mw-redirect" title="Angstrom">Å</a> = 1/10 nm</dd></dl> <div class="mw-heading mw-heading2"><h2 id="Longitud_d'ona_associada_a_partícules"><span id="Longitud_d.27ona_associada_a_part.C3.ADcules"></span>Longitud d'ona associada a partícules</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Longitud_d%27ona&action=edit&section=2" title="Modifica la secció: Longitud d'ona associada a partícules"><span>modifica</span></a><span class="mw-editsection-bracket">]</span></span></div> <p><a href="/wiki/Louis-Victor_de_Broglie" title="Louis-Victor de Broglie">Louis-Victor de Broglie</a> va postular que tota <a href="/wiki/Part%C3%ADcula" title="Partícula">partícula</a> que tingués <a href="/wiki/Moviment" title="Moviment">moviment</a> tenia associada una determinada longitud d'ona. Aquesta és descrita pel <a href="/wiki/Moment" title="Moment">moment</a> de la partícula "p" i la <a href="/wiki/Constant_de_Planck" title="Constant de Planck">constant de Planck</a> "h".<sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> </p> <dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle \lambda ={\frac {h}{p}}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>λ</mi> <mo>=</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mi>h</mi> <mi>p</mi> </mfrac> </mrow> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle \lambda ={\frac {h}{p}}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/3ba64e374ccd3f05ca8b646070a27e94a2b28921" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -2.338ex; width:6.629ex; height:5.843ex;" alt="{\displaystyle \lambda ={\frac {h}{p}}}"></span></dd></dl> <div class="mw-heading mw-heading2"><h2 id="Longitud_d'ona_tèrmica"><span id="Longitud_d.27ona_t.C3.A8rmica"></span>Longitud d'ona tèrmica</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Longitud_d%27ona&action=edit&section=3" title="Modifica la secció: Longitud d'ona tèrmica"><span>modifica</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Es coneix com a <a href="/w/index.php?title=Longitud_d%27ona_t%C3%A8rmica&action=edit&redlink=1" class="new" title="Longitud d'ona tèrmica (encara no existeix)">longitud d'ona tèrmica</a> aquella longitud d'ona associada a una partícula en un <a href="/wiki/Gas_ideal" title="Gas ideal">gas ideal</a> a una temperatura específica. S'utilitza per determinar, per exemple, si es pot considerar el gas mitjançant l'<a href="/wiki/Estad%C3%ADstica_de_Maxwell-Boltzmann" title="Estadística de Maxwell-Boltzmann">estadística de Maxwell-Boltzmann</a>. </p> <div class="mw-heading mw-heading2"><h2 id="Longitud_d'ona,_freqüència,_període_i_velocitat"><span id="Longitud_d.27ona.2C_freq.C3.BC.C3.A8ncia.2C_per.C3.ADode_i_velocitat"></span>Longitud d'ona, freqüència, període i velocitat</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Longitud_d%27ona&action=edit&section=4" title="Modifica la secció: Longitud d'ona, freqüència, període i velocitat"><span>modifica</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Per a una ona donada, la longitud d'ona λ és inversament proporcional a la <a href="/wiki/Freq%C3%BC%C3%A8ncia" title="Freqüència">freqüència</a> <i>f</i> i directament proporcional al seu <a href="/wiki/Per%C3%ADode_d%27oscil%C2%B7laci%C3%B3" title="Període d'oscil·lació">període</a> i a la seva velocitat de propagació <i>v</i>. La freqüència és la inversa del període <i>T</i>. Així: λ = v/f = v·T </p><p>En el cas de les <a href="/wiki/Ona_electromagn%C3%A8tica" title="Ona electromagnètica">ones electromagnètiques</a> (incloent la <a href="/wiki/Velocitat_de_la_llum" title="Velocitat de la llum">llum</a> i altres) la velocitat de propagació en el <a href="/wiki/Buit" title="Buit">buit</a> és de 300 mil quilòmetres per segon. En el cas de les ones <a href="/wiki/So" title="So">sonores</a>, la seva <a href="/wiki/Velocitat_del_so" title="Velocitat del so">velocitat</a> a l'<a href="/wiki/Aire" title="Aire">aire</a>, en condicions normals, és de 343 m/s. </p> <div class="mw-heading mw-heading2"><h2 id="Vegeu_també"><span id="Vegeu_tamb.C3.A9"></span>Vegeu també</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Longitud_d%27ona&action=edit&section=5" title="Modifica la secció: Vegeu també"><span>modifica</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Amplitud" title="Amplitud">Amplitud</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="Referències"><span id="Refer.C3.A8ncies"></span>Referències</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Longitud_d%27ona&action=edit&section=6" title="Modifica la secció: Referències"><span>modifica</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r33663753">.mw-parser-output .side-box{margin:4px 0;box-sizing:border-box;border:1px solid #aaa;font-size:88%;line-height:1.25em;background-color:#f9f9f9;display:flow-root}.mw-parser-output .side-box-abovebelow,.mw-parser-output .side-box-text{padding:0.25em 0.9em}.mw-parser-output .side-box-image{padding:2px 0 2px 0.9em;text-align:center}.mw-parser-output .side-box-imageright{padding:2px 0.9em 2px 0;text-align:center}@media(min-width:500px){.mw-parser-output .side-box-flex{display:flex;align-items:center}.mw-parser-output .side-box-text{flex:1;min-width:0}}@media(min-width:720px){.mw-parser-output .side-box{width:238px}.mw-parser-output .side-box-right{clear:right;float:right;margin-left:1em}.mw-parser-output .side-box-left{margin-right:1em}.mw-parser-output .side-box-center{clear:both;margin:auto}}</style><div class="side-box metadata side-box-right plainlinks"> <div class="side-box-flex"> <div class="side-box-image"><span typeof="mw:File"><span><img alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Commons-logo.svg/30px-Commons-logo.svg.png" decoding="async" width="30" height="40" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Commons-logo.svg/45px-Commons-logo.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Commons-logo.svg/59px-Commons-logo.svg.png 2x" data-file-width="1024" data-file-height="1376" /></span></span></div> <div class="side-box-text plainlist">A <span class="plainlinks"><a class="external text" href="https://commons.wikimedia.org/wiki/P%C3%A0gina_principal?uselang=ca">Wikimedia Commons</a></span> hi ha contingut multimèdia relatiu a: <i><b><a href="https://commons.wikimedia.org/wiki/Category:Wavelength" class="extiw" title="commons:Category:Wavelength">Longitud d'ona</a></b></i></div></div> </div> <div class="reflist {{#if: | references-column-count references-column-count-{{{col}}}" style="list-style-type: decimal;"> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-1"><span class="mw-cite-backlink"><a href="#cite_ref-1">↑</a></span> <span class="reference-text"><span class="citation" style="font-style:normal">«<a rel="nofollow" class="external text" href="http://www.enciclopedia.cat/gran-enciclopedia-catalana/0192031.xml">Longitud d'ona</a>». <i><a href="/wiki/Gran_Enciclop%C3%A8dia_Catalana" title="Gran Enciclopèdia Catalana">Gran Enciclopèdia Catalana</a></i>.  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