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A source is moving with constant speed u...

A source is moving with constant speed `upsilon_(s) = 20 m//s` towards a stationary observer due east of the source. Wind is blowing at the speed of `20 m//s` at `60^(@)` north of east. The source has frequency `500 H_(Z)`. Speed of sound `= 300 m//s`. The frequency resgistered by the observer is approximately

A

`541 H_(Z)`

B

`552 H_(Z)`

C

`534 H_(Z)`

D

`512 H_(Z)`

Text Solution

Verified by Experts

The correct Answer is:
C

`f' = f((nu + W cos 60^(@))/(nu +W cos 60^(@) - nu_(s)))`
`= 500 ((300 + 10)/(300 + 10 - 20))`
`= 534 H_(Z)`
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