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 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 $(\bar{v})$.
${}_0{n}^1={}_1{p}^1+{}_{-1}{\beta }^0+\bar{v}$