O-LevelPhysicsNuclear Physics5054/12 · May/June 2025 · Q381 Mark

An isotope has a half-life of 6000 years. How much time passes before the count rate due to emissions from a sample of the isotope decreases to 1/16 of the initial value?

A6000 years

B18000 years

C24000 years

D96000 years

✓ Correct answer

C: 24000 years

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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 2, question 38.

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