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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

`409`

B

`429`

C

`517`

D

`500`

Text Solution

Verified by Experts

The correct Answer is:
D
Source is moving towards the observer
`f' = f((nu)/(nu - nu_(s))) = 450 ((330)/(330 - 33))`
`f' = 500 H_(Z)`
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Knowledge Check

  • A whistle emitting a sound of frequency 450 Hz approaches a stationary observer at a speed of 33 m/s. Velocity of sound is 330 m/s. The frequency heard by the observer, in Hz, is :

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    B
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    C
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