O-LevelPhysicsNuclear Physics5054/11 · Oct/Nov 2025 · Q371 Mark

A smoke alarm contains a radioactive source, S. The useful emissions from S are blocked by a few centimetres of air. What is the useful radioactive radiation emitted by S?

Aalpha and gamma

Balpha only

Cbeta and gamma

Dbeta only

✓ Correct answer

B: alpha only

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Topic: Nuclear Physics, O-Level Physics (syllabus 5054). Multiple choice, 1 mark.
Source: O-Level Physics, Oct/Nov 2025 Paper 1 Variant 1, question 37.

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