1/50 or 0.02 seconds
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Period = 1 / frequency
Wave frequency f, and period of wave T are inverses, related by fT=1.
frequency = (wave speed)/(wavelength) frequency = 1/(period)
Period = reciprocal of frequency ( 1 / frequency ) = 1/50 = 0.02 second = 20 milliseconds
Period = 1/frequency = 1/250 = 0.004 = 4 milliseconds