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Chapter 26 Vocab.
Esparza's Ch. 26 Vocabulary
| Question | Answer |
|---|---|
| term that refers to how high or low sound frequencies appear to be. | 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 limit 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 |
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