Gallo ch 26 vocab
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| term that refers to how high or low sound frequencies appear to be. | pitch
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| term appiled to sound pitch too low to be heard by the human ear, that is, below 20 Hertz. | infrasonic
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| term appiled to sound frequencies about 20,000 hertz, the normal upper limit of human hearing. | ultrasonic
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| in mechanics, the act of squeezing material and reducing its volume; in sound, a pulse of compressed air )or other matter) opposite or rarefaction. | compression
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| a disturbance in air (or matter) in which the pressure is lowered. Opposite of compression. | rarefaction.
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| a frequency at which an elastic object, once energized, will vibrate. Minimum energy is required to continue vibartion at the frequency. also called resonant frequency. | natural 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 that sound through forced vibration. | forced vibration
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| 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. | resonance
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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. | beats
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