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A. The sun produces invisible rays called ultraviolet-A (UVA) or ultraviolet-B (UVB) that can damage the skin. Too much sun can cause sunburn, skin texture changes, and skin cancers. Rashes also can be attributed to sunlight. Even on cloudy days, UV radiation reaches the earth and can cause skin damage.
Most often, the emitted light has a lower energy (longer wavelength)than the absorbed light. So, most often any fluorescence we can see is produced by light withhigher energies (shorter wavelengths) than visible light. This shorter-wavelength light isultraviolet, the kind that causes sunburn.