Period = 1 / frequency
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Wave frequency f, and period of wave T are inverses, related by fT=1.
They are inverses. Seconds and Hertz are inverse units.
frequency = (wave speed)/(wavelength) frequency = 1/(period)
Wave frequency can be calculated by dividing the speed of the wave (if we're talking about electromagnetic waves in vacuum, that would be the speed of light, c) by wavelength.
Period = reciprocal of frequency ( 1 / frequency ) = 1/50 = 0.02 second = 20 milliseconds