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2014-12-02T16:48:26+05:30

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Frequency \nu = 200 Hz = 200 cycles/sec.

It means that the air particles vibrate to and fro 200 times in one second.

In one minute or 60 seconds, the source of sound vibrates 200 * 60
        = frequency * time duration  = 12, 000 cycles.

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2014-12-02T18:18:20+05:30
Frequency = 200 Hz = 200 cycles/second

In 60 seconds the source of sound vibrates = frequency × time duration                                                                                 =  200 × 60

                                                          =      12, 000 cycles.
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