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MHT CET 2025 (23 Apr, Shift 2) · Doppler Effect

Doppler Effect question from MHT CET 2025 (23 Apr, Shift 2)

Q18MHT CET 2025 · 23 APR · SHIFT 2Medium

Doppler Effect

If a source emitting waves of frequency ' $F$ ' moves towards an observer with a velocity $\frac{V}{3}$ and the observer moves away from the source with a velocity $\frac{V}{4}$ , the apparent frequency as heard by the observer will be ( $V =$ velocity of sound)

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Answer: (a)

Observer moving away, source approaching: $F' = F\,\dfrac{V - V_o}{V - V_s}$ .
$F' = F\,\dfrac{V - V/4}{V - V/3} = F\,\dfrac{3/4}{2/3} = \dfrac{9}{8}F$
So the answer is (a) $\dfrac{9}{8}F$ .

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