What is the unit of frequency?

Frequency is defined as the number of occurrences of a repeating event per unit of time. The standard unit of frequency in the International System of Units (SI) is the hertz (Hz). One hertz is equivalent to one cycle per second. This means that if something oscillates or cycles, such as a sound wave or an electromagnetic wave, at a frequency of 1 Hz, it completes one full cycle every second.

Understanding this concept helps differentiate frequency from other quantities measured in different units. For example, the decibel (dB) is a logarithmic unit used to express the intensity of sound or the power level of an electrical signal, while the meter (m) is a unit of length. The watt (W) is a unit of power, defined as the rate at which work is done or energy is transferred. Each of these units measures distinct physical properties, distinguishing them from frequency, which specifically involves time-based cycles.