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 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 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?

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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