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# Please help! In a simple pendulum experiment for determination of acceleration due to gravity (g), time taken for 20 oscillation 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 pe

In a simple pendulum experiment for determination of acceleration due to gravity (g), time taken for 20 oscillation 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:

• Option 1)

0.7%

• Option 2)

0.2%

• Option 3)

3.5%

• Option 4)

6.8%

Views

$g=\frac{4\pi^{2}\l}{T^{2}}$

$\frac{\Delta g}{g}=\frac{\Delta \l}{\l}+2\frac{\Delta T}{T}$

$=\frac{0.1}{55}+2 \times \frac{1}{30}=0.0685$

$\frac{\Delta g}{g}\times 100= 0.068 \times 100=6.85 \%$

=7 %

Option 1)

0.7%

Option 2)

0.2%

Option 3)

3.5%

Option 4)

6.8%

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