Physics 9702 · AS & A Level · Mass defect and nuclear binding energy

Mass defect and nuclear binding energy — practice question

One nuclear reaction that may occur inside a nuclear reactor is represented by the equation $^{235}_{92}\text{U} + ^{1}_{0}\text{n} \rightarrow ^{95}_{42}\text{Mo} + ^{139}_{57}\text{La} + 2^{1}_{0}\text{n} + x^{0}_{-1}\text{e}$. The nuclei and particles data are shown in Fig. 12.1.
(a)[1]

Find the value of $x$ for this nuclear reaction.

(b(i))[3]

Show that the energy equivalent of $1.00\,\text{u}$ is $934\,\text{MeV}$.

(b(ii))[3]

Calculate the energy, in $\text{MeV}$, released in this reaction. Give your answer to three significant figures.

(c)[2]

Suggest the forms of energy into which the energy calculated in (b)(ii) is transformed.

Worked solution & mark scheme

This 9-mark question has a full step-by-step worked solution and mark scheme. One marking point: “$x = 7$” …

  • Full mark scheme, point by point
  • Step-by-step worked solution
  • Write your answer & get it marked instantly by AI