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A train with a whistle that emits a note of frequency 800 Hz is approaching an observer at speed of 60 m s^-1,

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A train with a whistle that emits a note of frequency 800 Hz is approaching an observer at speed of 60 m s-1, the frequency of note heard byobserver is

A. 978 Hz

B. 980 Hz

C. 950 Hz

D. 900 Hz

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The Correct option is A. 978 Hz

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