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  4. A 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

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Q. A 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

MGIMS WardhaMGIMS Wardha 2010

Solution:

Speed = 360 rev/min $ =\frac{360}{60}rev/s=6\text{ }rev/s $ $ \therefore $ Frequency $ =6\times 60 $ $ =360\text{ }Hz $