The least count of a stopwatch is

PHYSICS · Single correct · A Level · Physics · Measurements and their errors · Measurements and their errors

Problem

0.2\,\mathrm{s}

. The time for

20

oscillations of a pendulum is measured to be

25\,\mathrm{s}

. The percentage error in the time period is (1)

1.2\%

(2)

0.8\%

(3)

1.8\%

(4) None of these