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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`

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

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