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Question

The frequency of a source of sound is 120 Hz. How many times does it vibrate in a minute ?


A

5200 times
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B

5800 times
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C

6000 times
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D

7200 times
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Solution

The correct option is D
7200 times
Frequency of the sound is the number of vibrations per second.
Frequency= No. of vibrationsTotal time in seconds

No. of vibrations=(Frequency) ×(Total time in seconds)

Given,
Frequency of sound = 120 Hz
Total time = 1 minute (1 minute=60 seconds)
No. of vibrations = 120×60=7200

The source vibrates 7200 times in a minute and produces a frequency of 120 Hz.


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