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In introductory mechanics, the momentum of a particle is its mass times its velocity. In electrodynamics, the momentum of a field is proportional to the cross-product of the electric field with the magnetic field. In special relativity, momentum is generalized to four-momentum.

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How is momentum conserved in pair production?

I saw today in book that the momentum in pair production is conserved. My question is, how could it be possible that the momentum is conserved? …
Nazim ur rehman's user avatar