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Two sources of sound A and B kept at a certain distance produce sound waves of the same frequency (n). An observer starts running from A and goes towards B. Then during his journey from A to B

A

he will hear sound notes of the same frequency

B

the sound received from A will be always of a frequency which is higher than n

C

the sound received from B will be always of the frequency which is lower than n

D

he will hear beats if the different in apparent frequencies is small

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The correct Answer is:
D
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