AbiKrafft Chapt 26
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| Pitch | Term that refers to how high or low sound frequencies appear to be. | ||||
| Infrasonic | Term applied to sound pitch too high to be heard by the human ear, that is, below 20 hertz. | ||||
| Ultrasonic | Term applied to sound frequencies above 20,000 hertz, the normal upper limit of human hearing. | ||||
| Compression | In sound, a pulse of compressed air (or other matter); opposite of rarefaction. | ||||
| Rarefaction | A disturbance in air (or matter) in which the pressure is lowered. Opposite of compression. | ||||
| Natural Frequency | 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. | ||||
| Forced Vibration | 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. | ||||
| Resonance | 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. | ||||
| Beats | 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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Created by:
akrafft
on 2010-11-22