JEE Main 10 Jan 2019 Shift 1 Solved Paper

Section: Physics

Question : 23 of 90

Marks: +1, -0

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 f1. If the speed of the train is reduced to 17 m/s, the frequency registered is f2. If speed of sound is 340 m/s,then the ratio f1∕f2 is :

[10 Jan 2019 Shift 1]

18/17
19/18
20/19
21/20

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