Doppler's Effect

A source emitting a sound 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 air is $$u$$.

Details And Assumptions:

$$v=500 \text{ Hz} , a= 10000 \text{ m/s}^2 , u=340 \text{ m/s}$$.

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