A train is traveling at 29.1 m/s, in still air. The frequency of the note emitte

Question

A train is traveling at 29.1 m/s, in still air. The frequency of the note emitted by the train whistle is 238 Hz.

A) What frequency f_approach is heard by a passenger on a train moving at a speed of 27.2 m/s, in the opposite direction with respect to the first train and approaching it?
(in Hertz)

B) What frequency f_recede is heard by a passenger on a train moving at a speed of 27.2 m/s, in the opposite direction with respect to the first train and receding from it?
(In Hertz)

C) What frequency f_combination is heard by a passenger on a train moving at a speed of 27.2 m/s, in the same direction as the source train and moving away from it.
(in Hertz)

Explanation / Answer

A)the frequency f is f = 29.1 * 238/27.2 Hz B)the frequency f is f1 = 27.2 * 238/29.1 Hz C)the frequency f is f2 = 238 Hz

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