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MHT CET 2025 (26 Apr, Shift 1) · Doppler Effect

Doppler Effect question from MHT CET 2025 (26 Apr, Shift 1)

Q17MHT CET 2025 · 26 APR · SHIFT 1Medium

Doppler Effect

A source of sound emits sound wave of frequency ' f ' and moves towards an observer with a velocity $\frac{V}{3}$ where V is the velocity of sound. If the observer moves away from the source with a velocity $\frac{V}{5}$ the apparent frequency heard by him will be

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Answer: (c)

Observer moving away, source approaching: $f' = f\,\dfrac{V - V_o}{V - V_s}$ .
$f' = f\,\dfrac{V - V/5}{V - V/3} = f\,\dfrac{4/5}{2/3} = \dfrac{6}{5}f$
So the answer is (c) $\dfrac{6}{5}f$ .

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