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A train approaching a railway platform with a speed of 20 ms–1 starts blowing the whistle. Speed of sound in air is 340 ms–1. If the frequency of the emitted sound from the whistle is 640 Hz, the frequency of sound to a person standing on the platform will appear to be A. 600 Hz B. 640 Hz C. 680 Hz D. 720 Hz

A train approaching a railway platform with a speed of 20 ms–1 starts blowing the whistle. Speed of sound
in air is 340 ms–1. If the frequency of the emitted sound from the whistle is 640 Hz, the frequency of sound
to a person standing on the platform will appear to be
A. 600 Hz B. 640 Hz C. 680 Hz D. 720 Hz

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1 Answers

Vikas TU
14149 Points
4 years ago
Dear student 
Correct option is C ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Good Luck ….............................................

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