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Gallo ch 26 vocab
Question | Answer |
---|---|
term that refers to how high or low sound frequencies appear to be. | pitch |
term appiled to sound pitch too low to be heard by the human ear, that is, below 20 Hertz. | infrasonic |
term appiled to sound frequencies about 20,000 hertz, the normal upper limit of human hearing. | ultrasonic |
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 |
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 vibartion at the 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 that sound through forced vibration. | forced vibration |
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 |
a periodic variation in the loudness of sound caused by interference when two tones of slightly different frequencies are sounded together. | beats |