Which ray contains positively charged particles?

The intensity of gamma radiation from a given source is $I$. On passing through $36 \, mm$ of lead,it is reduced to $\frac{I}{8}$. The thickness of lead which will reduce the intensity to $\frac{I}{2}$ will be......$mm$

In a radioactive decay process, the negatively charged emitted $\beta -$ particles are

How many alpha and beta particles are emitted when Uranium ${}_{92}U^{238}$ decays to lead ${}_{82}Pb^{206}$?

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

$A$ radioactive substance emits