Question
The period of oscillation of a simple pendulum is 
. The 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 wrist watch of 1 s resolution. The accuracy in the determination of g is:
-
2%
-
3%
-
1%
-
5%
Solution
B.
3%
Time period,
thus, changes can be expressed as
According to the question, we can write
Again time period
