Which type of UV radiation is characterized by shorter wavelengths and higher energy?

The correct response identifies UVB radiation as characterized by shorter wavelengths and higher energy compared to the other types of UV radiation. UVB rays, with wavelengths ranging from approximately 280 to 320 nanometers, are known for their ability to penetrate the skin more effectively than UVA rays, leading to sunburn and playing a significant role in developing skin cancer.

The energy of UVB rays is greater than that of UVA and UVC rays, which means they can cause more direct damage to DNA in skin cells. This energy level is also responsible for stimulating the production of vitamin D in the skin, which is beneficial for health, while still posing UV-related risks.

UVA radiation has longer wavelengths that range from 320 to 400 nanometers and is associated with skin aging and long-term skin damage. UVC radiation, with wavelengths shorter than those of UVB, is typically absorbed by the Earth’s atmosphere and does not reach the skin under natural conditions, making it less relevant in sun exposure contexts. UVD is not a recognized category in UV radiation classification.

Thus, the description of UVB's characteristics aligns correctly with the parameters of shorter wavelengths and higher energy, illustrating its impact on skin health and safety to be essential in understanding UV radiation.