A-LevelPhysicsNuclear physics9702/42 · Feb/Mar 2019 · Q127 Marks
The incomplete nuclear equation for one possible reaction that takes place in the core of a nuclear reactor is ⁹²²³⁵U + ₀¹n → ⁵⁷¹³⁹La + ₄₂⁹⁵Mo + 2₀¹n + ___
- (a)(i)State the name given to this type of nuclear reaction.[1]
- (a)(ii)Complete the nuclear equation.[2]
- (b)(i)The mass defect for the reaction is 0.223 u. Calculate the energy, in J, equivalent to 0.223 u.[2]
- (b)(ii)Suggest two forms of the energy released in this reaction.[2]
Mark scheme
Marking points from the official mark scheme (Feb/Mar 2019). The mark or mark type is shown in brackets.
- [B1] fission
- [M1] either ⁰₋₁e or ⁰₋₁β
- [A1] 7
- [C1] energy = c² Δm; = 0.223 × 1.66 × 10⁻²⁷ × (3.00 × 10⁸)²
- [A1] = 3.33 x 10⁻¹¹ J
- [B2] Any 2 from: kinetic energy of products; gamma photons; neutrinos
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