Q 12-13-022NEETJEE MainEasy
In beta-minus decay, a nucleus emits an electron. The electron comes from
Answer: (A) a neutron changing into a proton inside the nucleus
$n \to p + e^- + \bar{\nu}$. There are no electrons inside the nucleus; the electron is created when a neutron converts into a proton, so $Z$ increases by $1$ and $A$ is unchanged.
Solution by Sreeraj P, M.Sc Physics