Physics 9702 · AS & A Level · Atoms, nuclei and radiation
Atoms, nuclei and radiation — practice question
The equation shows the spontaneous radioactive decay of a bismuth-212 nucleus.
$^{212}_{83}\text{Bi} \rightarrow X + ^{208}_{81}\text{Tl} + 6.2\,\text{MeV}$
(a(i))[1]
Explain what is meant by spontaneous radioactive decay.
(a(ii))[1]
State the constituent particles in $X$.
(b(i))[2]
Use conservation of mass-energy to account for the release of $6.2\,\text{MeV}$ in this reaction.
(b(ii))[1]
Calculate the energy, in joules, that is released in this reaction.
Worked solution & mark scheme
This 5-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Decay rate not altered by external factors such as temperature or pressure” …