A train is traveling at 39.2 m/s, in still air. The frequency of the note emitte

Question

A train is traveling at 39.2 m/s, in still air. The frequency of the note emitted by the train whistle is 225 Hz. (1) What frequency, f approach, is heard by a passenger on a train moving at a speed of 24.7 m/s, in the opposite direction with respect to the first train and approaching it? (2) What frequency, f recede, is heard by a passenger on a train moving at a speed of 24.7 m/s, in the opposite direction with respect to the first train and receding from it? (3) What frequency, f combination, is heard by a passenger on a train moving at a speed of 24.7 m/s , in the same direction as the source train and moving away from it?

Explanation / Answer

What frequency is heard by a passenger on a train moving at a speed of 24.7 m/s relative to the ground in a direction opposite to the first train and approaching it? observer is moving 63.9 m/s toward the source. f = {343/(343-63.9)} * 225 = 276.51 Hz--> Answer What frequency is heard by a passenger on a train moving at a speed of 24.7.0m/s relative to the ground in a direction opposite to the first train and receding from it? Observer is moving 63.9 m/s away from the source f = {343/(343+63.9)} * 225 = 189.66 Hz --> Answer

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