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Chapter 26

QuestionAnswer
Term that refers to how high or low sound frequencies appear to be. pitch
Term applied to sound pitch too low to be heard by the human ear, that is, below 20 hertz. infrasonic
Term applied to sound frequencies above 20,000 hertz, the normal upper limit of human hearing. ultrasonic
In sound, a pulse of compressed air (or other matter); opposite of rarefaction. compression
A disturbance in air (or matter) in which the pressure is lowered. Opposite of compression. rarefaction
A frequency at which an elastic object, once energied, will vibrate. Minimum energy is required to continue vibration at that frequency. Also called a resonant frequency. natural frequency
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. forced vibration
A phenomenon that occurs when the frequency of forced vibrations on an object matches the objects natural frequency,and a dramatic increase in amplitued results. resonance
A periodic vibration in the loudness of sound caused by interference when two tones of slightly different frequencies are sounded together. beats
Created by: vahajuddin
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