First slide

Beats

Question

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

Easy

A

10 Hz
B

360 Hz
C

216 Hz
D

6 Hz

Solution

Frequency $= \frac{360}{60} \times 60 = 360 Hz .$

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