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A train moves towards a stationary obser...

A train moves towards a stationary observer with speed `34 m//s`. The train sounds a whistle and its frequency registered by the observer is `f_(1)`. If the train's speed is reduced to `17 m//s`, the frequency registered is `f_(2)`. If the speed of sound is `340 m//s` then the ratio `(f_(1))/(f_(2))` is :-

A

18/19

B

`1//2`

C

2

D

19/18

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The correct Answer is:
D
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