Final answer:
Ultraviolet radiation (UV) is the type of electromagnetic radiation that falls just outside the visible range, toward lower energy, with wavelengths from about 10 to 400 nanometers.
Step-by-step explanation:
The electromagnetic radiation that is just outside the visible range toward lower energy is known as ultraviolet radiation (UV). UV radiation has wavelengths ranging from about 10 to 400 nanometers, which is shorter than the shortest visible wavelengths. The visible range of the electromagnetic spectrum is flanked on the lower frequency side by infrared radiation and on the higher frequency side by ultraviolet radiation. This spectrum includes various types of electromagnetic waves such as radio waves, microwaves, infrared, visible light, ultraviolet light, X-rays, and gamma rays. All electromagnetic radiation, including UV, moves through a vacuum at a constant speed of approximately 3.00 × 10^8 m/s.