Question

A free neutron decays into a proton, an electron and.

• A. A neutrino
• B. An antineutrino
• C. An alpha particle
• D. A beta particle

Answer 1

Answer: (B)

An antineutrino

Answer 2

$0n^{1} =_{1}p^{1} +_{- 1}e^{0} + \bar{\nu}$

Antineutrino is required for conservation of spin.