Smart Tan Certification Practice Exam 2025 - Free Smart Tan Certification Practice Questions and Study Guide

The three categories of UV light rays are indeed UVA, UVB, and UVC. This classification is based on their wavelengths and the effects they have on living organisms and the environment.

UVA rays have the longest wavelengths, ranging from 320 to 400 nanometers. They penetrate deeply into the skin and are primarily responsible for skin aging, wrinkle formation, and can contribute to skin cancers.

UVB rays, with wavelengths between 290 and 320 nanometers, are responsible for causing sunburn and are a key factor in the development of skin cancer. These rays are more intense than UVA and vary in intensity based on the time of year, geographic location, and time of day.

UVC rays, ranging from 100 to 290 nanometers, are the most harmful of the three types due to their high energy; however, they are mostly absorbed by the Earth’s ozone layer and do not reach the surface in significant amounts.

Understanding these categories is crucial for comprehending the effects of UV radiation on skin health and the importance of protective measures, such as sunscreen and protective clothing, to mitigate damage.