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<p>The condition for resonance in a resonator is that the round trip distance, , is equal to an integer number of wavelengths  of the wave:</p>

<p>
:</p>

<p>If the velocity of a wave is , the frequency is  so the resonant frequencies are:</p>

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:</p>

<p>So the resonant frequencies of resonators, called <a href="page.php?w=normal_modes">normal modes</a>, are equally spaced multiples (<a href="page.php?w=harmonic">harmonic</a>s) of a lowest frequency called the <a href="page.php?w=fundamental_frequency">fundamental frequency</a>. The above analysis</p><p>
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