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The frequency of a source of sound is 20...

The frequency of a source of sound is 200 Hz. How many times does it vibrate in a minute?

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Since the frequency of the source of sound is 200 Hz, Number of vibrations of the source in 1 second = 200 Number of vibrations of the source in 1 minute
(i.e., 60 second) ` = 200 xx 60 = 12000 Hz`
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