In the following nuclear reaction,$x$ stands for: $n \rightarrow p + e^{-} + x$

The radioactive nucleus $_7N^{13}$ decays to $_6C^{13}$ through the emission of

The nucleus $_{48}^{115}Cd$ after two successive ${\beta ^ - }$ decays will give:

Out of the following, which one is not emitted by a natural radioactive substance?

$\alpha$-decay of a parent nucleus $X$ results in a daughter nucleus $Y$. If $m_x, m_y$ and $m_a$ are the masses of the parent nucleus, the daughter nucleus and the $\alpha$-particle respectively, then the net kinetic energy gained in the process is:

$_6^{12}C$ absorbs an energetic neutron and emits a beta particle. The resulting nucleus is