Physics (AS & A Level) · Oct / Nov 2021 · Paper 12 · Question 5

A student measures the time T for one complete oscillation of a pendulum of length l. Her results are shown in the table. l / m: 0.420 ± 0.001 T / s: 1.3 ± 0.1 She uses the formula T = 2π√(l/g) to calculate the acceleration of free fall g. What is the best estimate of the percentage uncertainty in the value of g?

1. A0.02%
2. B4%
3. C8%
4. D16%

As printed in the paper