O-LevelPhysicsNuclear Physics5054/12 · Oct/Nov 2019 · Q401 Mark

An isotope of lead, 212/82 Pb, is radioactive. After three decays, two beta-particles and an alpha-particle have been emitted. Another radioactive isotope of lead is formed. What is the mass number (nucleon number) of the new isotope of lead?

A200

B208

C212

D216

✓ Correct answer

B: 208

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Topic: Nuclear Physics, O-Level Physics (syllabus 5054). Multiple choice, 1 mark.
Source: O-Level Physics, Oct/Nov 2019 Paper 1 Variant 2, question 40.

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