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 
. If the train's speed is reduced to 17 m/s, the frequency registered is 
. If the speed of sound is 340 m/s, then the ratio 
is
A
19/18
B
2
C
18/19
D
1/2
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