A) ejection of an electron from a nucleus
B) ejection of an electron from a metal surface
C) ionization of a neutral atom
D) the production of an electron and a positron from \[\gamma -\]rays.
Correct Answer: D
Solution :
Pair production is just oppsite to mass annihilation. When suddenly \[\gamma -\]ray energy disappears to form a pair of a particle and an anti-particle, the process is called pair production.
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