A train is traveling at 30.0m/s relative to the ground in still air. The frequen

Question

A train is traveling at 30.0m/s relative to the ground in still air. The frequency of the note emitted by the train whistle is 262Hz . The speed of sound in air should be taken as 344m/s . What frequency f approach is heard by a passenger on a train moving at a speed of 18.0m/s relative to the ground in a direction opposite to the first train and approaching it? What frequency f recede is heard by a passenger on a train moving at a speed of 18.0m/s relative to the ground in a direction opposite to the first train and receding from it?

Explanation / Answer

What frequency is heard by a passenger on a train moving at a speed of 18.0 m/s relative to the ground in a direction opposite to the first train and approaching it? observer is moving 48 m/s toward the source. f = {343/(343-48)} * 262 = 305 Hz What frequency is heard by a passenger on a train moving at a speed of 18.0m/s relative to the ground in a direction opposite to the first train and receding from it? Observer is moving 48 m/s away from the source f = {343/(343+48)} * 262 = 230 Hz

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