What is frequency and its unit?

In physics, the term frequency refers to the number of waves that pass a fixed point in unit time . It also describes the number of cycles or vibrations undergone during one unit of time by a body in periodic motion.

Frequency describes the number of waves that pass a fixed place in a given amount of time . So if the time it takes for a wave to pass is is 1/2 second, the frequency is 2 per second. If it takes 1/100 of an hour, the frequency is 100 per hour.

In the most general sense, frequency is defined as the number of times an event occurs per unit of time . In physics and chemistry, the term frequency is most often applied to waves, including light, sound, and radio. Frequency is the number of times a point on a wave passes a fixed reference point in one second.3 May 2019

The number of periods or cycles per second is called frequency. The SI unit for frequency is the hertz (Hz) . One hertz is the same as one cycle per second.