A train standing at the outer signal of a railway station blows a whistle of frequency 400 Hz in still air. The train begins to move with a speed of 30 m s –1 towards the platform. The frequency of the sound heard by an observer standing on the platform is (speed of sound in air = 330 m s –1 )
Text Solution
Verified by ExpertsThe correct answer is:
C
Here, Frequency of source,
Speed of sound, v = 330 m 
Speed of source (i.e train),
As the source is moving towards stationary observer
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