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DistlersChap26Vocab
Question | Answer |
---|---|
pitch | term that refers to how high or low sound frequencies appear to be |
infrasonic | term applied to sound pitch too low to be heard by the human ear, that is, below 20 Hz |
ultrasonic | term applied to sound frequencies above 20,000 Hz, the normal upper limit of human hearing |
compression | 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 frequency are sounded together |