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Question

# Two cars A and B are moving away from each other in opposite directions. Both the cars are moving with a speed of 20 ms−1 with respect to the ground. If an observer in car A detects a frequency 2000 Hz of the sound coming from car B. what is the natural frequency of the sound source in car B ? (speed of sound in air =340 ms−1)

A
2300 Hz
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B
2150 Hz
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C
2250 Hz
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D
2060 Hz
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Solution

## The correct option is C 2250 HzFrom, Doppler's effect f′=f0(v±v0v±vS) ⇒ 2000=f0(340−20340+20) ∴ f0=2250 Hz Hence, (A) is the correct answer.

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