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A source of sound of frequency 1000 H(Z...

A source of sound of frequency `1000 H_(Z)` moves unifornly along a straight line with velocity `0.8` times velocity of sound . An observer is located at a distance `l= 250 m` from this line. Find
(a) the frequency of the sound at instant when the source is closest to the observer.
(b) the distance of the source when he observer no change in the frequency.

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The correct Answer is:
2777.8 Hz, 320 m
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