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Apparent Frequency:Source Moving

The disc of a...

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 = $60 \times \frac{360}{60} = 360 H z$

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