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Chapter 26 physics
PHYSICS VOCAB
| 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 hertz |
| ultrasonic | tern applied to sound and frequencies above 20,000 hertz, the normal upper limit of human hearing. |
| compression | in mechanics, the act of squeezing material and reducing its volume in sound, a pulse of compressed air or other matter. |
| rarefaction | a disturbance in air or matter in which the pressure is lowered. |
| natural frequency | a frequency at which an elastic object, once energized will vibrate. minimum energy is required to continue vibration at that frequency. |
| forced vibration | the vibration of an object that is made to vibrate by another vibrating object that is near by. the sounding board in a musical instrument amplifies the sound through forced vibrations. |
| resonance | 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. |
| beats | a periodic vitiation in the loudness of sound caused by interference when two tones of slightly different frequencies are sounded together. |
Created by:
Wardlaw
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