The total number of $\alpha$ and $\beta$ particles emitted in the nuclear reaction ${ }_{92}^{238} \mathrm{U} \rightarrow{ }_{82}^{214} \mathrm{~Pb}$ is

A nucleus $_n{X^m}$emits one $\alpha $ and one $\beta $ particles. The resulting nucleus is

A radioactive nucleus $_{92}{X^{235}}$decays to $_{91}{Y^{231}}$. Which of the following particles are emitted

When a uranium isotope ${ }_{92}^{235} U$ is bombarded with a neutron, it generates ${ }_{36}^{89} Kr$, three neutrons and:

$\gamma$-rays radiation can be used to create electron-positron pair. In this process of pair production, $\gamma$-rays energy cannot be less than .......$MeV$

If Alpha, Beta and Gamma rays carry same momentum, which has the longest wavelength