Question

annheliation and pair production​

Answer 1

Pair production is the creation of a subatomic particle and its antiparticle from a neutralboson. Examples include creating an electronand a positron, a muon and an antimuon, or a proton and an antiproton. Pair production often refers specifically to a photon creating an electron-positron pair near a nucleus. In order for pair production to occur, the incoming energy of the interaction must be above a threshold in order to create the pair – at least the total rest mass energy of the two particles – and that the situation allows both energy and momentum to be conserved.[1]However, all other conserved quantum numbers (angular momentum, electric charge, lepton number) of the produced particles must sum to zero – thus the created particles shall have opposite values of each other. For instance, if one particle has electric charge of +1 the other must have electric charge of −1, or if one particle has strangeness of +1 then another one must have strangeness of −1.
The probability of pair production in photon-matter interactions increases with photon energy and also increases approximately as the square of atomic number of the nearby atom.[2]

Answer 2

Hey mate here is your answer....☺

$\huge{\bold{\red{Annihilation}}}$

When a particle meets its antiparticle, the two annihilate each other to form two photons (due to conservation of momentum) with sum total energy equivalent to the total mass-energy of both particles. Sometimes, a pair of particles annihilates, but then the photon produces another pair of particles.

i hope it is helpful...☺☺