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Two persons A and B each carrying a source.of sound of frequency n, are standing a few meters apart in a quiet field. A starts moving towards B with a speed v0. If v be the speed of sound, the number of beats heard per second by A will be

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a

nvov

b

nVVo

c

nvov

d

2nVVo

answer is A.

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Detailed Solution

Tho apparent frequency received by 4 due to the source of B is given byn′=nV+VoV (observer moving towards source) {alsohearsthosoundofhissourcewhosehequencyisn Beat frequency =n′−n =nV+VOV−n =nVOV

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