# Period (physics) facts for kids

A **period** * T* is the time needed for one complete cycle of vibration to pass a given point. As the frequency of a wave increases, the period of the wave decreases.

*Frequency*and

*Period*are in a reciprocal relationship that can be expressed mathematically as:

*Period*equals the

*Total time*divided by the

*Number of cycles*.

- Orbital period is the time for something to go round (orbit) something else.
- The period of a pendulum is the time it takes from one side to the other and back.
- An electron moving in a helical orbit that has an axis at right angles to the magnetic field has a period given by T=2πm/qB, where m is the mass of the electron, q is the charge of the electron and B is the magnetic field in the region.

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Period (physics) Facts for Kids. *Kiddle Encyclopedia.*