What are the main differences between UV-A and UV-B rays?

The correct answer highlights the characteristics of UV-A and UV-B rays. UV-A rays penetrate deeper into the skin compared to UV-B rays. This ability allows UV-A to affect the deeper layers of the skin, potentially contributing to long-term skin damage, including premature aging and wrinkles. In contrast, UV-B rays are primarily responsible for causing sunburn due to their shorter wavelength and higher energy, which significantly impacts the outer layers of the skin.

Understanding the roles of these two types of ultraviolet radiation is crucial for effective tanning practices and sun safety. Tanners must recognize that while both UV-A and UV-B can cause skin damage, their different penetration levels and effects on the skin necessitate varied protective measures, such as the use of broad-spectrum sunscreens that guard against both types of rays.