Physics 9702 · AS & A Level · Atoms, nuclei and radiation
Atoms, nuclei and radiation — practice question
The nuclear equation $^{210}_{84}\text{Po} \rightarrow {}^{206}_{82}\text{Pb} + X$ represents the spontaneous decay of polonium.
(a(i))[1]
State what the nucleus of $X$ is composed of.
(a(ii))[2]
The nuclei $X$ emit this radiation. State two properties of the radiation.
(b)[3]
The mass of the polonium (Po) nucleus is larger than the combined mass of the nuclei of lead (Pb) and $X$. Using a conservation law, explain qualitatively how this decay can take place.
Worked solution & mark scheme
This 6-mark question has a full step-by-step worked solution and mark scheme. One marking point: “The nucleus contains 2 protons and 2 neutrons” …