O-LevelPhysicsNuclear Physics5054/11 · Oct/Nov 2023 · Q381 Mark

The isotope radon-222 has a half-life of 3.8 days. Which statement about a sample containing 1.0 mg of radon-222 is correct?

AAfter 1.9 days there is 0.50 mg of radon-222 left.

BAfter 3.8 days there is 0.50 mg of radon-222 left.

CIts half-life is half that of a 2.0 mg sample.

DThere is no radon-222 left after 7.6 days.

✓ Correct answer

B: After 3.8 days there is 0.50 mg of radon-222 left.

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Topic: Nuclear Physics, O-Level Physics (syllabus 5054). Multiple choice, 1 mark.
Source: O-Level Physics, Oct/Nov 2023 Paper 1 Variant 1, question 38.

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