A-LevelPhysicsNuclear physics9702/12 · May/June 2011 · Q401 Mark

Radon-220 is radioactive and decays to polonium-216 with the emission of an α-particle. The equation for the radioactive decay is shown. ²²⁰Rn -> ²¹⁶Po + ⁴He How many neutrons are in the radon and polonium nuclei?

ARn: 86, Po: 84

BRn: 134, Po: 132

CRn: 220, Po: 212

DRn: 220, Po: 216

✓ Correct answer

B: Rn: 134, Po: 132

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Topic: Nuclear physics, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, May/June 2011 Paper 1 Variant 2, question 40.

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