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<div class="vector-body-before-content"> <div class="mw-indicators"> </div> <div id="siteSub" class="noprint">From Wikiversity</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><div class="projectbox" style="border-color: #71be3f;"> <table class="projectbox-table" style="background-color: #f6fff1; height:100%;"> <tbody><tr><td class="projectbox-image" style="background-color: #c0eaa6;"><span typeof="mw:File"><a href="/wiki/File:Logo_physics.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/c/cc/Logo_physics.svg/36px-Logo_physics.svg.png" decoding="async" width="36" height="36" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/cc/Logo_physics.svg/54px-Logo_physics.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/cc/Logo_physics.svg/72px-Logo_physics.svg.png 2x" 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src="//upload.wikimedia.org/wikipedia/commons/thumb/0/07/Resonance.PNG/200px-Resonance.PNG" decoding="async" width="200" height="145" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/0/07/Resonance.PNG/300px-Resonance.PNG 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/0/07/Resonance.PNG/400px-Resonance.PNG 2x" data-file-width="3249" data-file-height="2351" /></a><figcaption>Resonance effect for various input <a href="/wiki/Frequency" title="Frequency">frequencies</a> and damping coefficients.</figcaption></figure><p>In <a href="/wiki/Physics" title="Physics">physics</a>, <b>resonance</b> is the tendency of a system to <a href="/wiki/Vibration" title="Vibration">vibrate</a> with increasing <a href="/wiki/Amplitude" title="Amplitude">amplitudes</a> at some <a href="/wiki/Frequency" title="Frequency">frequencies</a> of excitation. These are known as the system's <i>resonant frequencies</i> (or <i>resonance frequencies</i>) <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>. </p><p>An example of useful effect of resonant frequency is a <a href="/wiki/Guitar" title="Guitar">guitar</a> string which makes a characteristic noise when it is touched. The noise depends on how thick or slack the string is. </p><p>In <a href="/wiki/Earthquake_engineering" class="mw-redirect" title="Earthquake engineering">earthquake engineering</a>, on contrary, any possibility of a resonance is detrimental for the <a href="/wiki/Building" title="Building">building structure</a>. </p> <div class="mw-heading mw-heading2"><h2 id="Other_pages">Other pages</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Resonance&veaction=edit&section=1" title="Edit section: Other pages" class="mw-editsection-visualeditor"><span>edit</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Resonance&action=edit&section=1" title="Edit section's source code: Other pages"><span>edit source</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r2576580">.mw-parser-output .side-box{margin:4px 0;box-sizing:border-box;border:1px solid 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class="side-box-flex"> <div class="side-box-image"><span class="noviewer" 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">Wikimedia Commons has media related to <a href="https://commons.wikimedia.org/wiki/Category:Mechanical_vibrations" class="extiw" title="commons:Category:Mechanical vibrations"><span style="font-style:italic; font-weight:bold;">Mechanical vibrations</span></a>.</div></div> </div> <ul><li><a href="/wiki/Vibration_control" title="Vibration control">Vibration control</a></li></ul> <div class="mw-heading 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li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist"> <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">Tongue, Benson, <i>Principles of Vibration</i>, Oxford University Pres, 2001, <style data-mw-deduplicate="TemplateStyles:r2527938">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free a,.mw-parser-output .citation .cs1-lock-free 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