Question

A photon of $1.7\times {10}^{-13}$ Joules is absorbed by a material under special circumstances. The correct statement is

• A. Electrons of the atom of absorbed material will go the higher energy states
• B. Electron and positron pair will be created
• C. Only positron will be produced
• D. Photoelectric effect will occur and electron will be produced

Answer 1

The correct option is B Electron and positron pair will be created

For electron and positron pair production, minimum energy is 1.02 MeV.
Energy of photon is given $1.7\times {10}^{-3}J=\frac{1.7\times {10}^{-13}}{1.6\times {10}^{-19}}$
= 1.06 MeV.
Since energy of photon is greater than 1.02 MeV,
So electron, positron pair will be created.