The two photons produced in an electron-positron annihilation have equal but oppositely-directed momenta to match the zero momentum of the electron-positron pair. Which of the following conservation laws are obeyed in the pictured interaction?
a. Conservation of energy.
b. Conservation of momentum.
c. Conservation of charge.
d. Both a. and b. but not c.
e. All of a., b. and c.
e
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