O-LevelPhysicsNuclear Physics5054/11 · May/June 2025 · Q361 Mark

A radioactive nucleus X decays to another radioactive nucleus. After a number of decays, a stable nucleus Q is produced. The proton number (atomic number) of X is equal to that of Q. The nucleon number (mass number) of X is four more than that of Q. Which radiations are emitted to produce Q?

Atwo alpha-particles

Bone alpha-particle and one beta-particle

Ctwo alpha-particles and one beta-particle

Done alpha-particle and two beta-particles

✓ Correct answer

D: one alpha-particle and two beta-particles

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Topic: Nuclear Physics, O-Level Physics (syllabus 5054). Multiple choice, 1 mark.
Source: O-Level Physics, May/June 2025 Paper 1 Variant 1, question 36.

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