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9 Cards in this Set

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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
beats
a pulse of compressed air; opposite of rarefaction.
compression
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
term applied to sound pitch too low to be heard by the human, that is, below 20 hertz
infrasonic
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.
natural frequency
Term that refers to how high or low sound frequencies appear to be.
pitch
a disturbance in air in which the pressure is lowered. Opposite of compression.
rarefaction
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.
resonance
term applied to sound frequencies above 20000 hertz the normal upper limit of human hearing.
ultrasonic