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Question

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 f1. If the train's speed is reduced to 17 m/s, the frequency registered is f2 . If the speed of sound is 340 m/s then the ratio f1f2 is :


A

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B

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C

2

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D

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Solution

The correct option is D


f1=f(vvvs)

f1=f(34034034)=f(340306)

and f2=f(34034017)=f(340323)

f1f2=(323306)=1918


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