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Q.

A circular disc with 1800 holes is rotating at 720 r.p.m. If a jet of air passes through the holes, the frequency of sound emitted is

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a

21600 Hz 

b

2160 Hz

c

216 Hz

d

21.6 Hz 

answer is D.

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Detailed Solution

ω=2πT f=ω2π=72060×1800 =21600Hz

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A circular disc with 1800 holes is rotating at 720 r.p.m. If a jet of air passes through the holes, the frequency of sound emitted is