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SorensenChapter26
Sorensen Chapter 26 Vocab
| Question | Answer |
|---|---|
| 1.Pitch | term that refers to how high or low sound frequencies |
| 2.Infrasonic | term applied to sound pitch too low to be heard 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 mechanics, the act of squeezing material and reducing its volume. (b) 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 objects natural frequency, and a 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. |
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msorensen
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