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JEE Main 11 April 2015 Paper

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Question : 13

Total: 90

A source of sound emits sound waves at frequency f0. It is moving towards an observer with fixed speed (υs(υs<υ, where v is the speed of sound in air). If the observer were to move towards the source with speed υ0, one of the following two graphs (A and B) will give the correct variation of the frequency f heard by the observer as υ0 is changed.

The variation of f with υ0 is given correctly by:

graph A with slope =
f0
(v−vs)
graph A with slope =
f0
(v+vs)
graph B with slope =
f0
(v−vs)
graph B with slope =
f0
(v+vs)

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