UV-A: Long-wave ultraviolet, associated with skin aging. However, the Earth's ozone layer acts as a protective shield, absorbing the most dangerous UV-C rays and a significant portion of UV-B.
How the Atmosphere Blocks Most UV-C Radiation
Ultraviolet light represents a specific band of electromagnetic radiation that sits just beyond the violet end of the visible spectrum. Visible light occupies a narrow band in the middle, with colors ranging from red, which has the longest wavelength, to violet, which has the shortest.
This precise measurement is essential for both environmental monitoring and public health guidance. UV-A rays have the longest wavelengths, ranging from 315 to 400 nanometers, and are the least energetic.
How the Atmosphere Blocks Most UV-C Radiation
Ultraviolet light follows violet, making it the highest-energy form of visible light, even though it is invisible. This classification places UV light between visible violet light and X-rays, giving it properties that are distinct from both ordinary light and more penetrating radiation like gamma rays.
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