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

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

(a) 10Hz

(b) 360Hz

(c) 216Hz

(d) 60Hz

This question was posed to me in semester exam.

I'm obligated to ask this question of Progressive Waves topic in portion Waves of Engineering Physics I

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Right choice is (b) 360Hz

The explanation: Frequency of revolution of disc=360rpm=360/60rps=60rps

Frequency of emitted sound=6×No.of holes

=6×60=360Hz.

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