2022 · Specimen · 9702/04 | Q9

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Question (9 of 12)4 marks · Practise this topic →

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Available practice: 77 of 100 marks. Parts 1(b), 4(b)(i), 4(c), 6(a)(ii), 6(b)(ii), 7(a)(i), 7(a)(ii), 9(b)(i), 9(c), 10(b)(ii) await marking support. Scores cover available parts only.

Data for a nucleus and some particles are given in Table 9.1: ¹³⁹₅₇La 138.955 u; ¹₀n 1.00863 u; ¹₁p 1.00728 u; ⁰₋₁e 5.49 × 10⁻⁴ u.

One nuclear reaction that can take place in a nuclear reactor may be represented, in part, by the equation shown below. Complete the equation.

(a)²³⁵₉₂U + ¹₀n → ⁹⁵₄₂Mo + ¹³⁹₅₇La + 2 ¹₀n + .................... + energy

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Complete Fill in every gap. A partly completed answer usually scores partly.

[1 mark]

Data for a nucleus and some particles: ¹³⁹₅₇La has mass 138.955 u; ¹₀n 1.00863 u; ¹₁p 1.00728 u; ⁰₋₁e 5.49 × 10⁻⁴ u. The energy equivalent to 1.00 u is 934 MeV.

(b)(ii)Calculate the binding energy per nucleon, in MeV, of lanthanum-139 (¹³⁹₅₇La).

Answer guidance

Calculate Show your working. The method can earn marks even when the final value is wrong, and a bare answer often cannot.

[3 marks]

9702/04/SP/22Cambridge International AS & A Level Physics 9702 · Specimen 2022 · Paper 4 · Question 9