What is the SI unit of frequency?

The SI unit of frequency is hertz (Hz).

Frequency is defined as the number of cycles or oscillations per unit time. It is a fundamental concept in physics and is used to describe various phenomena, such as sound waves, electromagnetic waves, and atomic vibrations. The SI unit of frequency is hertz (Hz), which is defined as one cycle per second. For example, if a sound wave has a frequency of 440 Hz, it means that it completes 440 cycles per second.

The hertz is named after Heinrich Hertz, a German physicist who was the first to demonstrate the existence of electromagnetic waves. The hertz is widely used in scientific and engineering applications, such as in radio and television broadcasting, telecommunications, and electronics. It is also used in everyday life, such as in measuring the frequency of musical notes and the speed of computer processors.

In addition to the hertz, other units of frequency are also used, such as kilohertz (kHz), megahertz (MHz), and gigahertz (GHz). These units are used to describe higher frequencies, such as those used in radio and microwave communications. However, the hertz remains the standard unit of frequency in the SI system.