Question

what is time period of a pendulum ? what is its unit?

Answer 1

$2\pi \sqrt{l} \div g$
si unit second

Answer 2

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A pendulum is a weight suspended from a pivot so that it can swing freely. When a pendulum is displaced sideways from its resting, equilibrium position, it is subject to a restoring force due to gravity that will accelerate it back toward the equilibrium position. When released, the restoring force acting on the pendulum's mass causes it to oscillate about the equilibrium position, swinging back and forth. The time for one complete cycle, a left swing and a right swing, is called the period.

$units$

"The metric unit for frequency is Hertz which is one cycle per second."

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