In order for both energy and momentum to be conserved, a nucleus is usually involved when these particles decay into an electron and positron. Einstein's coefficients determine when these particles ar
In order for both energy and momentum to be conserved, a nucleus is usually involved when these particles decay into an electron and positron. Einstein's coefficients determine when these particles are emitted in systems which usually have undergone population inversion. The energy of these particles is sometimes sufficient to exceed a material's work function, and is proportional to their momentum. These particles were proven to diffract in Young's double-slit experiment, and their existence explains the photoelectric effect. For 10 points, identify these massless particles which move at the speed of light.
In order for both energy and momentum to be conserved, a nucleus is usually involved when these particles decay into an electron and positron.