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JEE Main 2022 (27 Jun, Shift 1) · Doppler Effect

Doppler Effect question from JEE Main 2022 (27 Jun, Shift 1)

Q38JEE Main 2022 · 27 JUN · SHIFT 1Easy

Doppler Effect

An observer moves towards a stationary source of sound with a velocity equal to one-fifth of the velocity of sound. The percentage change in the frequency will be:

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Answer: (a)

Observer approaching: $n' = n\frac{v + v_o}{v}$ .
$n' = n\left(1 + \frac{1}{5}\right) = 1.2n$
Change $= 20\%$ . So the answer is (a) 20%.

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