In the nuclear reaction $6C^{11} \rightarrow 5B^{11} + \beta^+ + X$,the particle $X$ is .......

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......$mm$

Which of the following can pass through $20 \, cm$ thickness of steel?

Curie is a unit of

Beta rays emitted by a radioactive material are

The particles emitted by radioactive decay that are deflected by a magnetic field are: