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A source of sound S is moving with a vel...

A source of sound S is moving with a velocity of `50m//s` towards a stationary observer. The observer measures the frequency of the source as 1000 Hz. What will be the apparent frequency of the source as 1000 Hz. What will be the apparent frequency of the source when it is moving away from the observer after crossing him? The velocity of the sound in the medium is `350m//s`

A

`750Hz`

B

`857Hz`

C

`1143Hz`

D

`1333Hz`

Text Solution

Verified by Experts

The correct Answer is:
A
When source is coming to the stationary observer , n.
`=((v)/(v-v_(s)))n` or `1000=((350)/(350-50))n` or `n=(1000xx300)/(350)Hz`
When the source is moving away from the stationary observer.
`n.=((v)/(v+v_(s)))=((350)/(300+50))((1000xx300)/(350))=750`
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