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A whistle giving out 450 H(Z) approaches...

A whistle giving out `450 H_(Z)` approaches a stationary observer at a speed of `33 m//s`. The frequency heard the observer (in `H_(Z)`) is (speed of sound `= 330 m//s`)

A

500 Hz

B

450 Hz

C

550 Hz

D

395 Hz

Text Solution

Verified by Experts

The correct Answer is:
A
The source is moving towards the observer
`:. n_(a) = n ((v)/(v - v_(s)))`
`= 450 xx (330)/(330 - 33) = 450 xx (10)/(9) = 500 Hz`
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