A-LevelPhysicsNuclear physics9702/12 · Feb/Mar 2016 · Q401 Mark

Thorium-234 (²³⁴₉₀ Th) decays by β⁻ emission into a daughter product which in turn decays by a further β⁻ emission into a granddaughter product. Which letter in the diagram represents the granddaughter product? [Figure 40.1]

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APoint A (nucleon number 233, proton number 92)

BPoint B (nucleon number 234, proton number 92)

CPoint C (nucleon number 233, proton number 89)

DPoint D (nucleon number 235, proton number 88)

✓ Correct answer

B: Point B (nucleon number 234, proton number 92)

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Topic: Nuclear physics, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Feb/Mar 2016 Paper 1 Variant 2, question 40.

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