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JEE Advanced 2017 Paper 2

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Question : 6

Total: 54

A person measures the depth of a well by measuring the time interval between dropping a stone and receiving the sound of impact with the bottom of the well. The error in his measurement of time is δ=T0.01 seconds and he measures the depth of the well to be L = 20 meters. Take the acceleration due to gravity g=10ms−2 and the velocity of sound is 300ms−1 Then the fractional error in the measurement,

, is closet to :

0.2%
5%
1%
3%

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