Answer :

publius
the frequency of a wave is the number of times the wave goes from peak to peak in a given unit of time the SI unit of frequency is Hertz (Hz) 1 Hz= 1 wave per second
AL2006
You can think of it as the number of wave peaks, or dips, that pass
a fixed point each second.

The unit is "per second", or "reciprocal time".  It's given the name "Hertz".

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