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Source and Listener Moving in Different Lines

A vehicle, wi...

Question

A vehicle, with a horn of frequency n, is moving with a velocity of 30 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 + n₁. Then n₁ is equal to (take velocity of sound in air as 330 m/s)

A

n_{1} = 10 n

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B

n_{1} = - n

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C

n_{1} = 0.1 n

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D

n_{1} = 0

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Solution

The correct option is D $n_{1} = 0$
No Doppler effect, because velocity is perpendicular to line joining vehicle and observer.

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Source and Listener Moving in Different Lines

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