In an experiment with a stretched string

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

Problem

In an experiment with a stretched string, the distance between the first and the seventh crest in a photograph is measured as

1.20\,\text{m}\pm0.02\,\text{m}

. At the same time, a stopwatch records that

50

complete oscillations occur in

2.0\,\text{s}\pm0.1\,\text{s}

. Using these data, calculate the percentage uncertainty in the value of the wave speed obtained from the experiment. (a) Approximately

5.3\%

(b) Approximately

9\%

6.7\%

(d) Approximately

7.1\%