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An engine giving whistle is moving towar...

An engine giving whistle is moving towards a stationary observer with `110m//s` speed. What will be the ratio of the frequency of the whistle heard when the engine is approaching and receding from the observer (the speed of sound is `330 m//s`) ?

A

`4:3`

B

`4:1`

C

`3:6`

D

`2:1`

Text Solution

Verified by Experts

The correct Answer is:
D
`n.=n((V)/(V-V_(S)))` as engine approaches
`n..=n((V)/(V+V_(S)))` as engine receeds
`implies(n.)/(n..)=(V+V_(S))/(V-V_(S))`
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