Frequency refers to the number of waves that pass a fixed point in a given amount of time, describing the number of cycles (waves, or VIBRATIONS) undergone during one unit of time by a body in periodic motion. A body in periodic motion is said to have undergone one cycle or one vibration after passing through a series of events or positions and returning to its original state.
f - number of occurrences of a repeating event per unit of time, measured in herts - Hz - equal to the number of events per second.
For example, when our heart beats at a frequency of 120 times a minute, the frequency at which the beat repeats is half a second (60 seconds divided by 120 beats) - 2 hertz - f=1/T.
Frequency is an important parameter used in science to specify the rate of vibrations phenomena, from mechanical vibrations, audio signals (sound), radio waves, and light.