Red light has a wavelength of ~700 nm, and a frequency of ~4.3*1014 Hz. Visible light makes up just a small part of the full electromagnetic spectrum. … The EM spectrum. Type of RadiationFrequency Range (Hz)Wavelength Rangevisible4 – 7.5*1014750 nm – 400 nmnear-infrared1*1014 – 4*10142.5 μm – 750 nmThe EM spectrum labman.phys.utk.edu › modules