What is the effect on the period of a pendulum if you decrease its length by 7.85%? (Answer this question in terms of the initial period T.)

0.955T

Explanation:

The effect on the period in case when there is a decrease in length by 7.85%

Let us assume the following items

Period = T

T= Beginning period

L = Beginning length

T' = Final period

L' = Final length

Based on the above information

As we know that

Therefore

Hence, the effect on the period is 0.955T

i think the answer would be b