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 δT = 0.01 seconds and he measures the depth of the well to be L = 20 meters. Take the acceleration due to gravity g = 10 ms–2 and the velocity of sound is 300 ms–1. Then the fractional error in the measurement, δL/L, is closest to
(A) 0.2%
(B) 1%
(C) 3%
(D) 5%
