Least count of a stop watch is frac{1}{5} second. time of 20 oscillations of a pendulum is measured

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1.Units, Dimensions and Measurement

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The least count of a stop watch is $\frac{1}{5}$ second. The time of $20$ oscillations of a pendulum is measured to be $25$ seconds. The maximum percentage error in the measurement of time will be .......... $\%$

A

$0.1$

B

$0.8$

C

$1.8$

D

$8$

Solution

(b)

$\Delta T =\frac{0.2}{20}$

$T =\frac{25}{20}=1.25$

$\frac{\Delta T }{ T }=\frac{\frac{0.2}{20}}{1.25} \times 100=0.8 \%$

Standard 11

Physics

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