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The engine of a train approaching a station whistles at a frequency of 440 Hz. A stationary observer on the platform notices a change of 40 Hz in the frequency as the engine passes him. If the velocity of sound is 330 m/s, the speed of the train is

The engine of a train approaching a station whistles at a frequency of 440 Hz. A stationary observer on the platform notices a change of 40 Hz in the frequency as the engine passes him. If the velocity of sound is 330 m/s, the speed of the train is

Grade:11

1 Answers

Phanindra
226 Points
5 years ago
We have one formula...
n' = n(V-Vobs)÷(V-Vsource)
Here,   V?obs  = 0 (since observer is at rest..)
V?source    = vel. Of train.....= ?
n'=40 hz  (given)
V=velocity of sound...=330 m/s  (given)
n=original frquency =440 hz (given) 
Now substitue the values to get V?source ....

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