# A source emitting a sound of frequency v is placed at a large distance from an observer. The source starts moving towards the observer with a uniform

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A source emitting a sound of frequency v is placed at a large distance from an observer. The source starts moving towards the observer with a uniform acceleration a. Find the frequency heard by the observer corresponding to the wave emitted just after the source starts. The speed of sound in the medium is v.

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Required frequency n
=(v+v_0)/(v-v_s)v=v/(v-at).v
=(v.v)/(v-a.(1/(2v))=(2vv^2)/(2vv-a)