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A train moves towards a stationary observer with a speed of 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


Solution

The correct option is D
f1=(34034034)f=109ff2=(34034017)f=2019ff1f2=1092019=1918

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