A railroad train is traveling at 30.0m/s in still air. The frequency of the note

Question

A railroad train is traveling at 30.0m/s in still air. The frequency of the note emitted by the train whistle is261Hz . The speed of sound is 344 m/s.

Part A

What frequency is heard by a passenger on a train moving in the opposite direction to the first at 18.0 m/s and approaching the first?

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Part B

What frequency is heard by a passenger on a train moving in the opposite direction to the first at 18.0 m/s and receding from the first?

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A railroad train is traveling at 30.0m/s in still air. The frequency of the note emitted by the train whistle is261Hz . The speed of sound is 344 m/s.

Part A

What frequency is heard by a passenger on a train moving in the opposite direction to the first at 18.0 m/s and approaching the first?

f =   Hz  

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Part B

What frequency is heard by a passenger on a train moving in the opposite direction to the first at 18.0 m/s and receding from the first?

f =   Hz  

SubmitMy AnswersGive Up

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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