Which type of UV ray is known for its highest energy?

The type of UV ray known for its highest energy is UV C. This classification of ultraviolet radiation is based on the wavelength of the rays. UV C radiation has the shortest wavelengths within the UV spectrum, typically ranging from 100 to 280 nanometers. This shorter wavelength corresponds to higher energy levels compared to UVA and UVB rays.

UV C rays are particularly noteworthy because they are mostly absorbed by the Earth's atmosphere, particularly by the ozone layer, and do not normally reach the Earth's surface. This absorption makes them less relevant to everyday exposure for humans, but in artificial settings, such as germicidal lamps, UV C is utilized for its ability to destroy bacteria and viruses due to its energetic nature.

In contrast, UVA rays have longer wavelengths and are thus lower in energy, leading to different effects, primarily related to skin aging and penetration into the skin layers. UVB rays, while also harmful and capable of causing sunburn and contributing to skin cancer, have a wider wavelength range than UV C but are not as high in energy.

This distinction in energy levels among the types of UV radiation is crucial in understanding their biological effects and relevance to health and safety.