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Apparent Frequency:Source Moving

A whistle giv...

Question

A whistle giving out 450 Hz approaches a stationary observer at a speed of 33 m/s. The frequency heard by the observer (in Hz) is :

A

409

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B

429

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C

517

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D

500

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Solution

The correct option is D
500

Source is moving towards the observer $f^{'} = f = (\frac{v}{v - v_{s}}) = 450 (\frac{330}{300 - 33})$

$f^{'} = 500 H z$

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