For alternative meanings, see ultraviolet (disambiguation). "UV" redirects here. For other uses, see UV (disambiguation). Ultraviolet (UV) light is electromagnetic radiation with a wavelength shorter than that of visible light, but longer than X-rays, that is, in the range 10 nm to 400 nm, corresponding to photon energies from 3 eV to 124 eV. It is so-named because the spectrum consists of electromagnetic waves with frequencies higher than those that humans identify as the colour violet.
All stories in Ultraviolet
Vipul Bansal didn't believe he was getting enough vitamin D. He's not alone. Although figures vary wildly, somewhere between ...