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Travelling Waves

Quick practice

Question 1 of 5

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 is 340 m/s, then the ratio f_1/f_2 is

A

2

B

1/2

C

19/18

D

18/19

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