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Q.

A source is moving with a constant speed of 10 m/s on a circular track of radius 200 m. It emits a sound of frequency 200 Hz. A listener stands at the centre of the circular track. The frequency received by the listener is (velocity of sound = 340 m/s)

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a

zero

b

200 Hz

c

190 Hz

d

210 Hz

answer is B.

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Detailed Solution

When the relative velocity between the source and the observer along the line joining them is zero, Doppler effect does not take place. Here the velocity of the source is always perpendicular to the line joining the source and observer.
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A source is moving with a constant speed of 10 m/s on a circular track of radius 200 m. It emits a sound of frequency 200 Hz. A listener stands at the centre of the circular track. The frequency received by the listener is (velocity of sound = 340 m/s)