A student must time a pendulum that swings once in about 2.00 s

PHYSICS · Single correct · CBSE · Physics · Units and Measurements · Units and Measurements

Problem

A student must time a pendulum that swings once in about 2.00 s. To keep the percentage uncertainty in the measured time below 0.25 %, which stopwatch should be chosen? (a) Hand-held stopwatch, least count 0.01 s0.01\,\text{s} (b) Digital stopwatch, least count 0.001 s0.001\,\text{s} (c) Stop-watch app, least count 0.05 s0.05\,\text{s} (d) Analogue lab stopwatch, least count 0.02 s0.02\,\text{s}

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