What is the most intense type of UV light emitted by the sun?

The most intense type of UV light emitted by the sun is UVB. While UVA rays are present in greater numbers and can penetrate deeper into the skin, which contributes to premature aging and tanning, UVB rays are responsible for causing sunburn and play a significant role in the development of skin cancer.

UVC rays are primarily absorbed by the Earth's atmosphere and do not reach the surface. So even though UVC is the most intense form of ultraviolet light, its lack of presence at the Earth’s surface makes it irrelevant in this context. D is not a recognized classification of ultraviolet light.

The focus on UVB rays highlights their potential harm, emphasizing the need for effective sun protection measures. Thus, when considering intensity in terms of impact on human health, UVB is indeed the most significant type emitted by the sun that directly affects the skin.