A train approaching a railway platform with a speed of 20 m s –1 starts blowing the whistle. Speed of sound in air is 340 m s –1 . If the frequency of the emitted sound from the whistle is 640 Hz, the frequency of sound as heard by person standing on the platform is
Text Solution
Verified by ExpertsThe correct answer is:
C
Here, Speed of source (ie., train), 
Speed of sound in air,
Frequency of the source,
The frequency heard by the person standing on the platform is
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