Which ray contains positively charged particles?

Write nuclear reaction equations for:
$(i)$ $\alpha$-decay of $^{226}_{88}Ra$
$(ii)$ $\alpha$-decay of $^{242}_{94}Pu$
$(iii)$ $\beta^-$-decay of $^{32}_{15}P$
$(iv)$ $\beta^-$-decay of $^{210}_{83}Bi$
$(v)$ $\beta^+$-decay of $^{11}_{6}C$
$(vi)$ $\beta^+$-decay of $^{97}_{43}Tc$
$(vii)$ Electron capture of $^{120}_{54}Xe$

The intensity of gamma rays is reduced to half when they pass through a lead sheet of thickness $2.5 \, mm$. The absorption coefficient of lead is ......... $mm^{-1}$.

In medicine,to destroy cancer cells . . . . . . rays are used.

Choose the correct nuclear process from the below options $[p : \text{proton}, n : \text{neutron}, e^{-} : \text{electron}, e^{+} : \text{positron}, v : \text{neutrino}, \overline{v} : \text{antineutrino}]$.

The rate of disintegration of a radioactive sample can be increased by: