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Characteristic of sound waves
Frequency refers to the number of complete back-and-forth vibrations of a medium per unit of time. It is measured in Hertz, with one Hertz equaling one vibration per second. All particles in a vibrating medium oscillate at the same frequency, transferring sound waves that are detected by the ear at that frequency. Frequency can also refer to the number of compressions or rarefactions that pass a given point per unit of time in a sound wave.
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Characteristic of sound waves
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- 2. “How often” theparticles of the medium vibrate when it passes a medium. It is the number of complete back-and- forth vibrations of a particle per unit of time. Frequency
- 3. Unit: Hertz (Hz) where:1 Hertz= 1 vibration/second Frequency
- 4. Each particle ofthe medium vibrates at the same frequency. This is sensible since each particle vibrates due to the motion of its nearest neighbour. Frequency
- 5. o Subsequently, a guitarstring vibrating at 500 Hz will set the air particles in the room vibrating at the same frequency of 500 Hz, which carries a sound signal to the ear of a listener, which is detected as a 500 Hz sound wave.
- 6. Frequency Also refersto the number of compressions (high pressure) or rarefactions (low pressure) that pass a given point per unit of time. A detector could be used to detect the frequency of these pressure oscillations over a given period of time.
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- 8. The frequency issimply the reciprocal of the period. A sound wave with a high frequency would correspond to a pressure time plot with a small period while sound wave with low frequency would correspond to a pressure time plot with a large period Frequency
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