Question

Relativistic quantum physics predicts that every fundamental particle has a corresponding antiparticle. When a particle and it’s antiparticle collide, they are mutually annihilated. But total energy and total momentum must be conserved. What carries the energy and momentum after the annihilation?

Answer 1

Answer : When a particle and its antiparticle collide,they are mutually annihilated.These annihilations do not occur in a purely random way however; they must obey 3 rules.The conservation of energy, the conservation of momentum and the conservation of charges.

Consider  the annihilation of an electron e- and its antiparticle the positron e+.The combined mass is converted into pure energy in the form of photons. (2 gamma-ray photons are necessary to conserve momentum) and charge. Since the charges cancel at the beginning before the collision there is no net charge after collision.