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A train on a straight track sounds a 400 Hz horn when passing a parked car on the road. The train is moving at

 

A train on a straight track sounds a 400 Hz horn when passing a parked car on the road. The train is moving at 20 m/s and the temperature is 10C. Find the apparent frequency of the horn for a person sitting inside the car when the train is approaching and when the train is moving away.

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