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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

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For the stationary observer, `v. = (v)/(v - v_s) xx v`
`because v_1 = (340)/(340- 34) xx v and v_2 = (340)/(340-17) xx v`
Hence, `(v_1)/(v_2) = (340-17)/(340 -34) = (19)/(18)`
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