Question

if time period of simple pendulum is 2 second then its length is​

Answer 1

Hey mate here is your answer hope it helps

Answer 2

Ur ans is

The new period will be double.

Explanation: We know that for a simple pendulumT=2π√lg where T is the period, g is gravity acceleration   and l the pendulum lenght

In these conditions, if the new lenght is L=4l, the new period T`

T'=2π√Lg=2π√4lg=2π√4√lg=2⋅2π√lg=2T

Hope so.. it helps u .