__ __**Frequency** (*ν*) is the number of complete oscillations or vibrations in 1 s. It is the inverse of time period (T).

So, the frequency is,

Unit of frequency is s^{-1}or Hz (Hertz).

__ __**Time period ** of a wave is the time taken by a vibrating particle to make one complete vibration or it can be also defined as the time taken by a wave to move a distance equal to its wavelength. It is denoted by T. Its unit is second.

timePeriod and frequency are each others' reciprocals.

Time period = 1 / frequency.

Frequency = 1 / time period.

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