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

50 Hz

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100 Hz

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150 Hz

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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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