Annihilation is assumed to be a “complete obliteration of an object”. When an electron and a positron collide, they annihilate and disappear, giving off two gamma rays in the process. The particles appear to have vanished and all energy is transferred to the gamma rays (photons).
PAIR PRODUCTION
Pair production is the opposite of annihilation. Mysteriously, particles can appear from nowhere. Matter is created from an energetic photon (gamma ray). In the pair production process, a photon is absorbed and a particle and its anti-particle appear (electron and a positron pair). Energy is conserved, keeping with the laws of physics, as the photon must be equal to or greater than the sum of the two particle energies. However, it is incredibly strange that two particles randomly appear. This only happens in the quantum world. Two objects in the visible world that we see would never disappear and appear randomly.
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