A train is traveling at 30.0 relative to the ground in still air. The frequency

Question

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

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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