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A source of sound of frequency n is moving towards a stationary observer with a speed S. If the speed of sound in air is V and the frequency heard by the observer is n₁, the value of $n_{1} / n$ is

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(V+S)/V

V/(V+S)

(V−S)/V

V/(V−S)

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detailed solution

Correct option is D

By using n'=nvv−vS⇒n1n=VV−S

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A source of sound of frequency n is moving towards a stationary observer with a speed S. If the speed of sound in air is V and the frequency heard by the observer is n1, the value of n1/n is

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A source of sound of frequency n is moving towards a stationary observer with a speed S. If the speed of sound in air is V and the frequency heard by the observer is n₁, the value of $n_{1} / n$ is