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A car is fitted with a device which produces sound of frequency 60 Hz There...

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Physics

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A car is fitted with a device which produces sound of frequency 60 Hz There is no wind and speed of sound in stil air is 345 m s 1 An observer moving towards car with speec of 12 m s 1 hear sound of frequency 68 Hz The speed of th car is 20 m s 1 towards observer 25 m s1 towards observer 30 m s 1 towards observer 30 m s 1 away from observer

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