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Q.

A source and listener are both moving towards each other with speed v/10, where v is the speed of sound. If the frequency of the note emitted by the source is f, the frequency heard by the listener would be nearly

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a

1.11 f

b

1.22 f

c

f

d

1.27 f

answer is B.

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Detailed Solution

When source and listener both are moving towards each other then, the frequency heardn'=n v+vOv−vS⇒n'=f v+v/10v−v/10=1.22 f.
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