Physics-
General
Easy
Question
A train A crosses a station with a speed of 40 m/ s and whistles a short pulse of natural frequency 
. Another train B is approaching towards the same station with the same speed along a parallel track. Two tracks are d = 99m apart. When train A whistles, train B is 152m away from the station as shown in fig. If velocity of sound in air 
, calculate frequency of the pulse heard by driver of train B
- 724 Hz
- 660 Hz
- 742 Hz
- 427 Hz
The correct answer is: 724 Hz
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In the figure given : 
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In the figure given :
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