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| Term that refers to how high or low sound frequencies appear to be. |
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| Term applied to sound pitch too low to be heard by the human ear, that is, below 20 hertz. |
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| Term applied to sound frequencies above 20,000 hertz, the normal upper limit of human hearing. |
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| In sound, a pulse of compressed air (or other matter); opposite of rarefaction. |
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| A disturbance in air (or matter) in which the pressure is lowered. Opposite of compression. |
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| A frequency at which an elastic object, once energized, will vibrate. Minimum energy is required to continue vibration at that frequency. Also called resonant frequency. |
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| The vibration of an object that is made to vibrate by another vibrating object that is nearby. The sounding board in a musical instrument amplifies the sound through forced vibration. |
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| A phenomenon that occurs when the frequency of forced vibrations on an object matches the object's natural frequency, and a dramatic increase in amplitude results. |
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| A periodic variation in the loudness of sound caused by interference when two tones of slightly different frequencies are sounded together. |
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