This is all I know The wave number is k = 2π/λ, where λ is the wavelength of the wave. The frequency f of the wave is f = ω/2π, ω is the angular frequency. The speed of any periodic wave is the product of its wavelength and frequency. The speed of any electromagnetic waves in free space is the speed of light c = 3*108 m/s. It’s how calculate the speed of electromagnetic wave I’m sorry if this is not what you need