What form of energy is UV light?

Ultraviolet (UV) light is a form of invisible radiation that is part of the electromagnetic spectrum. It occupies a wavelength range that is shorter than that of visible light but longer than X-rays. Due to its wavelengths, UV light is not visible to the human eye, which is why it is often referred to as "invisible radiation."

UV radiation is divided into three types: UVA, UVB, and UVC, each having different energy levels and effects. These properties enable UV light to be used effectively in water treatment processes, such as disinfection, as it can deactivate microorganisms without the use of chemicals.

In the context of the other options, visible light is perceptible to the human eye, infrared radiation has longer wavelengths than visible light and is primarily associated with heat, while ultraviolet radiation refers specifically to the portion of the spectrum that includes UV light. Therefore, the answer correctly identifies UV light as a type of invisible radiation.