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

Explain the conservation of linear momentum for the radioactive decay of a radium nucleus.

$A$ radioactive nucleus emits a beta particle. The parent and daughter nuclei are

$A$ free neutron decays into a proton, an electron and

The atomic mass number of the element thorium is $232$ and its atomic number is $90$. The end product of this radioactive element is an isotope of lead (atomic mass $208$ and atomic number $82$). The number of alpha and beta particles emitted is:

$A$ nucleus of lead $Pb_{82}^{214}$ emits two electrons followed by an $\alpha$-particle. The resulting nucleus will have