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NEET UG PHYSICS MCQ: WAVES

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Understanding +4 | -1
A source emits a sound of frequency of 400  Hz400\,\,Hz, but the listener hearts its 390  Hz390\,\,Hz. Then
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Correct option: C
The listener is moving away from the source
Option C (The listener is moving away from the source) is correct because the observed frequency is lower than the emitted frequency, indicating the listener is moving away from the source.

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