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Two cars A and B are moving away from ea...

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)`)

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