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When an engine passes near to a stationary observer then its apparent frequencies occurs in the ratio 5/3. if the velocity of sound is 340 m/s then speed of engine is
A. 540 m/s
B. 270 m/s
C. 85 m/s
D. 52.5 m/s

1 Answer

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Best answer
Correct Answer - C
`(f_(1))/(f_(2))=(V+V_(s))/(V-V_(s))`
`V_(s)=85 m//s`

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