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Chap26 phys. SPinner
Question | Answer |
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1.Pitch | Term that refers to how high or low sound frequencies appear to be |
2.Infrasonic | Term applied to sound pitch too low to be hears by the human ear, that is, below 20 hertz. |
3.Ultrasonic | Term applied to sound frequencies above 20,000 hertz, the normal upper limit of human hearing |
4.Compression | In sound, a pulse of compressed air (or other matter); opposite of rarefaction |
5.Rarefaction | A disturbance in air (or matter) in which the pressure is lowered. Opposite of compression. |
6.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 |
7.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. |
8.Resonance | a phenomenon that occurs when the frequency of forced vibrations on an object matches the object's natural frequency, and dramatic increase in amplitude results |
9.Beats | A periodic variation in the loudness of sound caused by interference when two tones of slightly different frequencies are sounded together. |