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A source of sound emits waves at frequency f0 . It is moving towards an observer with fixed speed vs(vs<v, where v is the speed v0, One of the following twp graphs (A and B) will give the correct variation of the frequency f heard by the observer as v0 is changed . The variation f with v0 is given correctly by :

graphAwithslope=f0(vvs)graphAwithslope=f0(v+0vs)graphBwithslope=f0(vvs)graphBwithslope=f0(v+vs)

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