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Question

A source of sound and a detector are placed at the same place on ground. At t = 0, the source S is projected towards reflector with velocity V0 in vertically upward direction and reflector starts moving down with constant velocity V0. At t = 0, the vertical separation the reflector and source is H(>v202g) . The speed of sound in air is v(>>v0). Take f0 as the frequency of sound waves emitted by source. Based on above information answer the following questions.


A

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B

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C

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D

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Solution

The correct option is A


Actual frequency emitted by source doesn't upon the velocity of source but frequency heard due to relative motion between the observer and the source.


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