Question

When a neutron is disintegrated to give $\beta$-particle, ............

• A. a proton alone is emitted
• B. a proton and an antineutrino are emitted
• C. a neutrino alone is emitted
• D. a proton and neutrino are emitted

Answer 1

Answer: (B)

a proton and an antineutrino are emitted

Answer 2

A beta minus particle $\left(\beta^{-}\right)$ is an electron. Emission of $\beta^{-}$ involves transformation of a neutron into a proton, an electron and a third particle called antineutrino $(\bar{v})$.
${ }_{0} n^{1}={ }_{1} p^{1}+{ }_{-1} \beta^{0}+\bar{v}$