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9 Cards in this Set
- Front
- Back
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a throbbing variation in the loudness of sound caused by interference when two tones of slightly different frequencies are sounded together
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beats
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a pulse of compressed air; opposite of rarefaction.
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compression
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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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forced vibration
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term applied to sound pitch too low to be heard by the human, that is, below 20 hertz
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infrasonic
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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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natural frequency
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Term that refers to how high or low sound frequencies appear to be.
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pitch
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a disturbance in air in which the pressure is lowered. Opposite of compression.
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rarefaction
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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 aplitude results.
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resonance
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term applied to sound frequencies above 20000 hertz the normal upper limit of human hearing.
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ultrasonic
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