Two trains on separate but parallel tracks are moving in the same direction. The fast train is moving 200 km/h and the slower train is moving 100 km/h. The slow train blows its horn with a frequency of 600 Hz. Determine the frequency the faster train hears as it approaches the slower train from behind. Determine the frequency the faster train hears after it passes the slower train.

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We will apply Doppler effect to this case...

A close examination of the problem permits us to assume that the slower train can be considered stationary and the faster train to be approaching it with a velocity given by the difference of the two trains.

So the ...

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