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NEET 1998 (AIPMT) · Doppler Effect

Doppler Effect question from NEET 1998 (AIPMT)

Q82NEET 1998 · AIPMTEasy

Doppler Effect

A vehicle, with a horn of frequency $n$ is moving with a velocity of $30\text{ m/s}$ in a direction perpendicular to the straight line joining the observer and the vehicle. The observer perceives the sound to have a frequency $n + n_1$ . Then (if the sound velocity in air is $300\text{ m/s}$ )

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Answer: (b)

Doppler shift depends only on the velocity component along the line joining source and observer.
The vehicle moves perpendicular to this line, so that component is zero.
So $n' = n$ , i.e. $n_1 = 0$ . So the answer is (b).

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