Question

Solve this:
Question
If a simple pendulum completes 20 oscillations in 50 seconds, where the time is measured by a stopwatch of least count 0.2 second. Then percentage error in measurement of time period is
A. 0.8 %
B. 0.2 %
C. 1.6 %
D. 0.4 %

Answer 1

Dear Student ,
The percentage error is ,

$\%error=\frac{∆t}{T}\times 100=\frac{0·2}{50}\times 100=0·4\%$
Regards