Question

what is the time period of vibration

Answer 1

I think 20 vibration per second.

Answer 2

One complete to and fro movement of the pendulum bob is called one vibration or one oscillation.

The time taken by pendulum bob to complete one vibration or one oscillation is called the time period of pendulum.

The time taken by a vibrating object to complete one vibration is called its time period.

The time taken by one vibration or oscillation of a simple pendulum is very short and hence cannot be measured accurately. So to find the time taken by 1 vibrations we measure the time taken by a large number of vibration. Dividing the total time by the total number of vibrations we get the time for one vibration of the pendulum. For a given pendulum ,the time period is the same every time.

The time period of a pendulum depends only on the length of Pendulum. It does not depend on amplitude of vibrations.

hope it helps you