A train moves towards a stationary observer with speed 
. The train sounds a whistle and its frequency registered by the observer is 
If the speed of the train is reduced to 
the frequency registered is 
If speed of sound is 
, then the ratio 
is:
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
JEE Main 2019
According to Doppler's effect, when source is moving but observer at rest
and 
or 
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