Definition:Frequency (Physics)

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Definition

Let $f \left({t}\right)$ be a periodic function of time $t$.


The frequency of $f$ is the number of periods of $f$ that occur during a unit time interval.


Dimension

The dimension of measurement of frequency is: $T^{-1}$.


Units

The SI unit of measurement of frequency is the hertz $\mathrm {Hz}$:

$1 \ \mathrm {Hz} = 1 \ \mathrm{s}^{-1}$

that is, $1$ per second of time.