Wavespeed = frequency x wavelength
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Frequency = Wave speed / Wavelength.
Speed(v) = wavelength(λ) x frequency(f).
Any wave. Of you have a wave (light, water etc.), it will have a frequency and a wavelength. Multiply these and you get the speed at which the wave is moving.
The speed or velocity of a wave is equal to the wavelength times the frequency. The period (amount of time for one wavelength to occur) is equal to 1 over the frequency (the inverse of its frequency).
velocity = frequency multiply wavelength Rearrange the equation to find the frequency