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Question

A source of sound emitting a note of frequency 200 Hz moves towards an observer with a velocity v equal to the velocity of sound. If the observer also moves away from the source with the same velocity v, the apparent frequency heard by the observer is


A
50 Hz
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B
100 Hz
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C
150 Hz
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D
200 Hz
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Solution

The correct option is D 200 Hz
Since there is no relative motion between observer and source, therefore there is no apparent change in frequency.

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