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Producing Siren Sound

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A siren can be made by blowing a jet of air through 20 equally spaced holes in a rotating disk. The time it takes for successive holes to move past the air jet is the period of the sound. The siren is to produce a 2,200 Hz tone. What must be the angular speed (omega) in rad/s of the disk?

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Solution Summary

This solution calculates the angular speed of a rotating disk to produce a siren with a 2,200 Hz tone.

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A 2,200 Hz tone will have a period of 1 / 2,200 seconds.
Each rotation of the disk will be ...

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