Two trains A and B, beep simultaneously with a frequency of 392 Hz. Train A is in rest and train B moves away from train A at a speed of 35 m/s. A listener is among the two trains and moves following train B with a speed of 15 m/s. adopt the speed of sound in air as v = 342 m/s. There is no wind. a) What is the frequency that the listener hears from train B? b) What is the frequency of beats that the listener hears?

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