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Question

The disc of a siren containing 60 holes rotates at a constant speed of 360 rotations per minute. The emitted sound is in unison with a tuning fork of frequency :

A
270 Hz
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B
360 Hz
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C
480 Hz
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D
540 Hz
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Solution

The correct option is C 360 Hz
Number of holes in the disk determines the number of waves produced on each rotation=60
The total number of waves per second determines the frequency of the sound. So frequency = 60×36060=360Hz

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