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Essmyer Ch.26 Vocab Test

Enter the letter for the matching Answer
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1.
a disturbance in air or matter in which the pressure is lowered. Opposite of compression.
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2.
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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3.
term applied to sound frequencies above 20,000 hertz, the normal upper linit of human hearing.
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4.
term applied to sound pitch too low to be heard by the human ear, that is, below 20 hertz.
A.
natural frequency
B.
rarefaction
C.
ultrasonic
D.
infrasonic
Type the Answer that corresponds to the displayed Question.
incorrect
5.
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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6.
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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7.
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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8.
term that refers to how high or low sound frequencies appear.
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9.
in sound, a pulse of compressed air or other matter; opposite of rarefaction.

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