A source of sound emitting a note of frequency \( 200 \mathrm{~Hz} ...

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A source of sound emitting a note of frequency \( 200 \mathrm{~Hz} \) moves towards an observer with a velocity \( v \) equal to the velocity of sound. If the observer also moves away from
\( \mathrm{P} \) the source with the same velocity \( v \), the apparent frequency heard by the observer is

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(A) \( 50 \mathrm{~Hz} \)
(B) \( 100 \mathrm{~Hz} \)
(C) \( 150 \mathrm{~Hz} \)
(D) \( 200 \mathrm{~Hz} \)
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