Errors

Question

The least count of a stopwatch is 1/5 second. The time for 20 oscillations of a pendulum is measured to be 25 seconds. The percentage error in the measurement of time will be

Easy

Solution

The error in measurement of 25 seconds is $\frac{1}{5}$

$\therefore $ error in measurement of time = $\frac{\frac{1}{5}}{25}\times 100=0.8\%$

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