Wavelength is the distance between two successive crests or troughs in a wave. And time period is the time taken for the disturbance to move from one crest to the successive one. So wavelength/ wave period (time period) = speed of the wave.
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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.
Just divide the wavelength by the wave period, and you've got the wave speed.
Wavelength*Frequency = Velocity of the wave. or Wavelength/Period = Velocity of the wave.
frequency = (wave speed)/(wavelength) frequency = 1/(period)
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