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Frequency is a measure of the number of occurrences of a repeating event per
unit time. For rotations, oscillations or waves, it is defined as a number of
cycles per unit of time. To calculate the frequency, the number of occurrences
of the event within a fixed time interval are counted, and then it's divided by
the length of the time interval. So, Frequency = 1 / Time
In SI system, the unit of frequency is hertz (Hz), named after Heinrich Hertz.
For example, 1 Hz means that an event repeats once per second, 2 Hz is twice
per second, etc.
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