A man is standing on a railway platform listening to the whistle of an engine that passes the man at constant speed without stopping. If the engine passes the man at time 
. How does the frequency f of the whistle as heard by the man changes with time
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
When the train is approaching the stationary observer frequency heard by the observer 
when the train is moving away from the observer then frequency heard by the observer 
it is clear that 
and 
are constant and independent of time. Also and n' > n".
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