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nak
Chapter 26
| 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 energied, will vibrate. Minimum energy is required to continue vibration at that frequency. Also called a 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 objects natural frequency,and a dramatic increase in amplitued results. | resonance |
| A periodic vibration in the loudness of sound caused by interference when two tones of slightly different frequencies are sounded together. | beats |
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vahajuddin
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