Light with a maximum of intensity in the blue spectral region, created when charged particles move in a translucent medium at a speed v, this being greater than the speed of light in this medium (v > c0/n, c0 = speed of light in a vacuum, n = refractive index). The threshold energyAbility to do work or diffuse heat. The unit of energy is th... for the occurrence of Cerenkov radiationEnergy dispersion through matter or space. In atomic physics... for electronElementary particle with a negative electrical elementary ch... radiationEnergy dispersion through matter or space. In atomic physics... in water (n = 1.33) amounts to 260 keVKiloelectron volt; 1 keV = 1,000 eV; See 'Electron volt'..