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A source and an observer move away from each other with same velocity of $10 {ms}^{- 1}$ with respect to ground. If the observer finds the frequency of sound coming from the source as 1980 Hz, then actual frequency of the source is $(speed of sound in air = 340 {ms}^{- 1})$

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2486 Hz

2100 Hz

1950 Hz

2132 Hz

answer is B.

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