Electromagnetic waves are categorized according to their frequency f or, equivalently, according to their wavelength λ = c/f. Visible light has a wavelength range from ~400 nm to ~700 nm. … The EM spectrum. Type of RadiationFrequency Range (Hz)Wavelength Rangeradio waves< 3*1011> 1 mmThe EM spectrum labman.phys.utk.edu › modules › The EM spectrum