A source of sound emits sound waves at frequency `f_(0)`. It is moving towa
Channel: Doubtnut
Date: 2020-02-16

A source of sound emits sound waves at frequency `f_(0)`. It is moving towards an observer with fixed speed `v_(s)(v_(s) lt v` where v is the speed in air). If the observer were to move towards the source with speed `v_(0)` one of the following two graphs (A and B) will give the correct variation of the frequency f heard by the observer as `v_(0)` is changed, The variation of f with `v_(0)` is given correctly by :-