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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

Verified by Experts

The correct Answer is:
D
`f_(1) = f((nu)/(nu - nu_(s)))`
`f_(1) = f((340)/(340 - 34)) = f((340)/(306))`
and `f_(2) = f((340)/(340 - 17)) = f((340)/(323))`
`:. (f_(1))/(f_(2)) = (323)/(306) = (19)/(18)`
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