T=Period
F=frequency
T=1/F
Period=1/F
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The frequency of a wave is equal to the reciprocal of the period, meaning:
F = (1/P)
F = Frequency
P = Period
Period = 1 / frequency
Wave frequency f, and period of wave T are inverses, related by fT=1.
Wave speed is the distance a wave travels in a given period of time. Frequency is the number of oscillations in a given period of time. The third leg of the triangle is wavelength--the distance between peaks of the wave. Given any two of these values for a wave, you can calculate the third.
frequency = (wave speed)/(wavelength) frequency = 1/(period)
Period = reciprocal of frequency ( 1 / frequency ) = 1/50 = 0.02 second = 20 milliseconds