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Essmyer Ch.26 Vocab
Question | Answer |
---|---|
term that refers to how high or low sound frequencies appear. | pitch |
term applied to sound pitch too low to be heard by the human ear, that is, below 20 hertz. | infrasonic |
term applied to sound frequencies above 20,000 hertz, the normal upper linit of human hearing. | ultrasonic |
in sound, a pulse of compressed air or other matter; opposite of rarefaction. | compression |
a disturbance in air or matter in which the pressure is lowered. Opposite of compression. | rarefaction |
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 |
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 |
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. | resonance |
a periodic variation in the loudness of sound caused by interference when two tones of slightly different frequencies are sounded together. | beats |