Method for the sensitometry of industrial x - ray films for energies up to 3 million electron volts 能量达3百万电子伏工业用x射线胶片感光度的测定方法
Ionizing an atom of hydrogen takes an energy of 13 . 6 electron volts , an amount delivered by a photon of ultraviolet light 游离氢原子需要13 . 6电子伏特,相当于一个紫外光光子所能提供的能量。