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)`)

2250 Hz

2060 Hz

2300 Hz

2150 Hz

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A source and a detector moveaway fro each other, each with a speed of 10 ms^-1 with respect to the grond with no wind. If the detector detects a frequency 1950 Hz of the sound coming from thesorce, what is the original frequency of the source? Speed of sound in air =340 ms^-1 .

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