Does the visible portion of the electromagnetic spectrum represent a large portion of the spectrum?
Electromagnetic radiation begins with what might be termed “radio waves” and goes up from there. There are a number of “radio” bands, and they take up much of the spectrum. Microwaves top the list, and lead to the infrared (IR) radiation that sits just below the visible spectrum (or optical spectrum). Above visible light we have ultraviolet (UV) radiation, and beyond that, X-rays and cosmic rays. A picture might be worth a couple of hundred words, and by using the links below you can find diagrams plus additional information.
