Question

A commuter train blows its horn as it passes a passenger platform at a constant speed...

A commuter train blows its horn as it passes a passenger platform at a constant speed of 37.3 m/s. The train horn sounds at a frequency of 340 Hz when the train is at rest. What is the frequency observed by a person on the platform as the train approaches?

What is the frequency observed by that person as the train recedes from him?

Calculate the wavelength for the approaching train.

Calculate the wavelength for the receding train.

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Answer #1

Velocity of train Vs = 37.3 m/s

Velocity of observer Vo = 0 m/s

Velocity of sound V = 330 m/s

Frequency of sound ( commuter train blows its horn) f = 340 hz

Apparent frquency of sound is f',

Apparent frquency of sound is f1', when source of sound (train) approaches the passenger Vs = -Vs

Apparent frquency of sound is f2', when source of sound (train) recedes from the passenger Vs = Vs

Wavelegth of the train

the wavelength for the approaching train

the wavelength for the receding train

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