question_answer

The period of oscillation of a simple pendulum is \[T=2\pi \sqrt{\frac{L}{g}}.\]Measured value of L is 20.0 cm known to 1 mm accuracy and time for 100 oscillations of the pendulum is found to be 90 s using a wrist watch of 1s resolution. The accuracy in the determination of g is: [JEE MAIN 2015]

A)  1%      

B)                   5%

C)  2%                  

D)       3%

Correct Answer: D

Solution :

[d]