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

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18/19

1/2

19/18

answer is D.

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Detailed Solution

$f_{1} = f (\frac{340}{340 - 34}) \Rightarrow f_{2} = f (\frac{340}{340 - 17}); \frac{f_{1}}{f_{2}} = \frac{19}{18}$

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