What rays of the sun cause sunburns and tanning and are also known as burning rays?

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Multiple Choice

What rays of the sun cause sunburns and tanning and are also known as burning rays?

Explanation:
Sun exposure involves ultraviolet radiation, which comes in UVA, UVB, and UVC bands. The term "burning rays" refers to the UVB portion because of its energy and its prominent role in causing sunburn. UVB rays have wavelengths roughly 280–315 nanometers and primarily affect the epidermis, the outer skin layer. They directly damage skin cell DNA, leading to inflammation, redness, and the familiar painful burn after short exposure. That same acute reaction also triggers melanin production, resulting in a tan as the skin tries to protect itself. UVC is mostly absorbed by the atmosphere and doesn’t reach the skin under normal conditions. Infrared rays are heat—not UV—and don’t drive sunburn or tanning. UVA rays penetrate more deeply and contribute to tanning and photoaging, but they’re less responsible for the immediate burning sensation. So, the rays most associated with both sunburn and tanning, and historically called burning rays, are UVB rays.

Sun exposure involves ultraviolet radiation, which comes in UVA, UVB, and UVC bands. The term "burning rays" refers to the UVB portion because of its energy and its prominent role in causing sunburn. UVB rays have wavelengths roughly 280–315 nanometers and primarily affect the epidermis, the outer skin layer. They directly damage skin cell DNA, leading to inflammation, redness, and the familiar painful burn after short exposure. That same acute reaction also triggers melanin production, resulting in a tan as the skin tries to protect itself.

UVC is mostly absorbed by the atmosphere and doesn’t reach the skin under normal conditions. Infrared rays are heat—not UV—and don’t drive sunburn or tanning. UVA rays penetrate more deeply and contribute to tanning and photoaging, but they’re less responsible for the immediate burning sensation.

So, the rays most associated with both sunburn and tanning, and historically called burning rays, are UVB rays.

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