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Question

If a source emitting waves of frequency f moves towards an observer with a velocity v/3 and the observer moves away from the source with a velocity v/4, the apparent frequency as heard by the observer will be : (v = velocity of sound)

A
(9/8) f
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B
(8/9) f
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C
(3/4) f
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D
(4/3) f
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Solution

The correct option is C (9/8) f
Apparent frequency:
f1=(vvovvs)f
=⎜ ⎜vv4vv3⎟ ⎟f
=⎜ ⎜ ⎜3v42v3⎟ ⎟ ⎟f
f1=(98)f

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