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An observer is moving away from a source...

An observer is moving away from a source of sound of frequency 100 Hz at aspeed of `33ms^-1`. If the spped of the sound in air is `330ms^-1` and the observed frequency is

A

90 Hz

B

100 Hz

C

91 Hz

D

110 Hz

Text Solution

Verified by Experts

The correct Answer is:
A
Observer moving away from the source, then the apparent frequency `n'=nxx((v-v_0)/v)`
`n'=100xx((330-33)/330)`
`n'=100xx((297)/330)`
=90Hz
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