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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 observer is $f_{1}$ . If the speed of the train is reduced to 17m/s, the frequency registered is $f_{2}$ .
If speed of sound is 340 m/s, then the ratio $\frac{f_{1}}{f_{2}}$ is

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$\frac{18}{17}$

$\frac{19}{18}$

$\frac{20}{19}$

$\frac{21}{20}$

answer is B.

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Detailed Solution

$f^{1} = f (\frac{V}{V - V_{s}})$

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