Frequency is the number of occurrences of a repeating event per unit time. It is also referred to as temporal frequency. The period is the duration of one cycle in a repeating event,
so the period is the reciprocal of the frequency. Loosely speaking, 1 year is the period of the Earth's orbit around the Sun,and the Earth's rotation on its axis has a frequency of 1 rotation per day.
Waves, such as sound waves or light waves, can be oscillations,and therefore they may have a frequency. The frequency of an oscillating sound wave
helps determine its pitch, while the frequency of a light wave helps determine its color.
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