Question

γ-rays radiation can be used to create electronpositron pair. In this process of pair production, γ-rays energy cannot be less than
(a) 5.0 MeV(b) 4.02 MeV
(c) 15.0 MeV(d) 1.02 MeV

Answer 1

d)1.02MeV is the ANSWER......................