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# In a simple pendulum experiment for determination of acceleration due to gravity (g), time taken for $$20$$ oscillations is measured by using a watch of $$1$$ second least count. The mean value of time taken comes out to be $$30 s$$. The length of pendulum is measured by using a meter scale of least count $$1 mm$$ and the value obtained is $$55.0 cm$$. The percentage error in the determination of g is close to :-

A
$$0.7 \%$$
B
$$0.2 \%$$
C
$$3.5 \%$$
D
$$6.8 \%$$
Solution
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#### Correct option is D. $$6.8 \%$$$$T = \dfrac{30 sec}{20}$$ $$\Delta T = \dfrac{1}{20} sec$$$$L = 55 cm$$ $$\Delta L = 1 \, mm = 0.1 \, cm$$$$g = \dfrac{4 \pi^2 L}{T^2}$$ percentage error in g is $$\dfrac{\Delta g}{g} \times 100 \% = \left(\dfrac{\Delta L}{L} + \dfrac{2 \Delta T}{T} \right) 100\%$$$$= \left(\dfrac{0.1}{55} + \dfrac{2 \left(\dfrac{1}{20} \right)}{\dfrac{30}{20}} \right) 100 \% = 6.8 \%$$

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