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Chapter 26 physics


pitch term that refers to how high or low sound frequencies appear to be.
infrasonic term applied to sound pitch too low to be heard by the human ear, that is, below 20 hertz
ultrasonic tern applied to sound and frequencies above 20,000 hertz, the normal upper limit of human hearing.
compression in mechanics, the act of squeezing material and reducing its volume in sound, a pulse of compressed air or other matter.
rarefaction a disturbance in air or matter in which the pressure is lowered.
natural frequency a frequency at which an elastic object, once energized will vibrate. minimum energy is required to continue vibration at that frequency.
forced vibration the vibration of an object that is made to vibrate by another vibrating object that is near by. the sounding board in a musical instrument amplifies the sound through forced vibrations.
resonance a phenomenon that occurs when the frequency of forced vibrations on an object matches the objects natural frequency, and a dramatic increase in amplitude results.
beats a periodic vitiation in the loudness of sound caused by interference when two tones of slightly different frequencies are sounded together.
Created by: Wardlaw
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