Physics 9702 · AS & A Level · Atoms, nuclei and radiation
Atoms, nuclei and radiation — practice question
A uranium-235 nucleus takes in a neutron and then breaks apart into two nuclei. One possible nuclear reaction is given by $^{235}_{92}\text{U} + ^{a}_{b}\text{n} \rightarrow ^{93}_{37}\text{Rb} + ^{c}_{d}\text{X} + 2\,^{a}_{b}\text{n} + \text{energy}$.
(a)[1]
State the particles that make up the uranium-235 nucleus.
(b)[3]
Complete Fig. 7.1 for this reaction.
(c)[1]
Suggest a possible form of energy given out in this reaction.
(d)[2]
Explain, using the law of mass-energy conservation, how this reaction releases energy.
Worked solution & mark scheme
This 7-mark question has a full step-by-step worked solution and mark scheme. One marking point: “92 protons, together with 143 neutrons” …