UVB rays have:

The correct understanding of UVB rays is that they have shorter, stronger wavelengths compared to UVA rays. UVB rays range from about 290 to 320 nanometers, while UVA rays have a longer wavelength, typically from 320 to 400 nanometers. The shorter wavelength of UVB rays means they carry more energy, which allows them to cause more significant damage to the skin, including sunburn and contributing to the risk of skin cancer.

This is critically important in skin analysis because UVB rays are primarily responsible for triggering the skin's protective response through melanin production, leading to tanning, but also for the harmful effects associated with overexposure. Understanding this distinction is essential for appropriately advising clients on sun protection and skincare routines.