What is the Frequency? How is it represented? Write its S.I. unit.

Frequency refers to the number of occurrences of a repeating event per unit of time. It is an essential concept in physics and is widely used in the study of oscillations, waves, and periodic phenomena.

Representation of Frequency:
Frequency is commonly denoted by the symbol f (or sometimes the Greek letter ν, pronounced "nu").

S.I. Unit of Frequency:
The S.I. (International System of Units) unit of frequency is the hertz (Hz). One hertz represents one cycle (or event) per second. For example, if a pendulum completes 2 oscillations in one second, its frequency is 2 Hz.

Mathematical Representation:
Frequency is calculated using the formula: f = 1 / T
where:

f is the frequency in hertz (Hz),
T is the time period (the time taken for one complete cycle or oscillation), measured in seconds (s).
Example:
If a wave takes 0.2 seconds to complete one oscillation, the frequency is:
f = 1 / T = 1 / 0.2 = 5 Hz.
Thus, the wave's frequency is 5 hertz.