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Mohit Mittal Grade: 12

a man standing on railway platform listening to the whistle of an engine tat passes the man at constant speed at time "   t''   ".

Hoow does the frequency as heard by man changes wid time.

Sketch the graph of "f vs t".

7 years ago

Answers : (1)

vikas askiitian expert
510 Points

frequency heard by listener from t=0 (when train was approaching and was far apart ) to t=T (when train passes the listener) is constant & given by

f = fo(V/V-Vt)                      (Vt = speed of train, V speed of sound)

when train has passed the listener then frequency again becomes constant but now it is f1

f1 = fo(V/V+Vt)

now plot this graph by using these two eq

7 years ago
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