Electromagnetic radiation is a wave of energy traveling at the speed of light.
Ultraviolet radiation is in the electromagnetic spectrum range of 100 and 400 nm. Looking at the electromagnetic spectrum chart on the next page, you will find UV radiation between visible light and X-rays. The Electromagnetic Spectrum There are three types of UV radiation identified within the 100 to 400 nm range. However, prolonged and direct exposure to the sun means more exposure to damaging UV radiation. Last modified May 17, 2000.