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Question

A train moves towards a stationary observer with speed 34 m/s. The train sound a whistle and its frequency registered by the observer is f1. If the trains speed is reduced to 17 m/s, the frequency registered is f2. If the speed is reduced to 340 m/s then ratio f1/f2 is

A
18/19
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B
1/2
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C
2
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D
19/18
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Solution

The correct option is D 19/18
for stationary observes
f=vvu× Original frequency
Situation 1.
f1=34034034f

=340306f
Situation 2.
f2=34034017

=340323

Now f1f2=340306×323340

f1f2=1918

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