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The ratio of the apparent frequencies of the horn of a car when approaching and receding a stationary observer is 11:9 .

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The ratio of the apparent frequencies of the horn of a car when approaching and receding a stationary observer is 11:9 . If the velocity of sound in air is  300 ms-1 , the speed of the car is ................ m /sec

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us, uo = 0, v = 300 m/s

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