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BITSAT 2018 Slot 2 Solved Paper

Section: Physics
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Question : 6 of 150
 
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A train moves towards stationary observer with speed 34m∕s. The train blows whistle and its frequency is registered by the observer as f1. If the train's speed is reduced to 17m∕s, the frequency registered is f2. If the speed of sound is 340m∕s, then the ratio
t1
f2
 is
Validate
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