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A source and an observer move away from each other with a velocity of 10 m/s with respect to ground. If the observer finds the frequency of sound coming from the source as 1950 Hz, then actual frequency of the source is (velocity of sound in air = 340 m/s)

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1950 Hz

2068 Hz

2132 Hz

2486 Hz

answer is B.

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Detailed Solution

$n^{'} = n (\frac{v - v_{O}}{v + v_{S}}) = n (\frac{340 - 10}{340 + 10}) = 1950 \Rightarrow n = 2068 Hz$

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