The length of simple pendulum executing SHM is increased by`21%`. By what` % ` time period of pendulum increase ?

Explanation

To solve the problem of how much the time period of a simple pendulum increases when its length is increased by 21%, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the relationship between length and time period:**
The time period \( T \) of a simple pendulum is given by the formula:
\[
T = 2\pi \sqrt{\frac{L}{g}}
...