# Frequency

The number of complete cycles of a periodic process occurring per unit time. The frequency is expressed in Hertz (Hz), which corresponds to one cycle per second.

- **Natural frequency** – The frequency at which free oscillation occurs.

The number of complete cycles of a periodic process occurring per unit time. The frequency is expressed in Hertz (Hz), which corresponds to one cycle per second.

- **Natural frequency** – The frequency at which free oscillation occurs.