Question

The phenomenon of pair production is :

• A. The production of an electron and a positron from $\gamma$ radiation
• B. Ejection of an electron from a metal surface when exposed to ultraviolet light
• C. Ejection of an electron from a nucleus
• D. Ionization of a neutral atom

Answer 1

The correct option is A The production of an electron and a positron from $\gamma$ radiation

Pair production :
Gamma rays of sufficient energy when passing near a nucleus disappear and materialize into pair of an electron and a positron.
To have pair production, minimum energy of $\gamma$ - ray radiation is 1.02MeV.