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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 of `340 m//s`, then the ratio `f_(1)//f_(2)`is

A

`(18)/(19)`

B

`(1)/(2)`

C

`2`

D

`(19)/(18)`

Text Solution

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The correct Answer is:
d
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