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

Question

A train is traveling at 30.0 m/s relative to the ground in still air. The frequency of the note emitted by the train whistle is 262 Hz . The speed of sound in air should be taken as 344 m/s . A: What frequency (approaching) 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? B:What frequency (receding) 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 receding from it? 0

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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