O-LevelPhysicsNuclear Physics5054/11 · May/June 2012 · Q401 Mark

An isotope X is radioactive and has a half-life of 4 years. A sample initially contains 8000 atoms of X. After how many years will the sample contain 1000 atoms of X?

C12

D16

✓ Correct answer

C: 12

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Topic: Nuclear Physics, O-Level Physics (syllabus 5054). Multiple choice, 1 mark.
Source: O-Level Physics, May/June 2012 Paper 1 Variant 1, question 40.

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