O-LevelPhysicsNuclear Physics5054/11 · May/June 2011 · Q381 Mark

Tritium is a radioactive isotope of hydrogen with a half-life of 12 years. If a sample starts with 40 million atoms of tritium, how many atoms of tritium will be left after 12 years?

A40 million

B20 million

C10 million

D5 million

✓ Correct answer

B: 20 million

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Topic: Nuclear Physics, O-Level Physics (syllabus 5054). Multiple choice, 1 mark.
Source: O-Level Physics, May/June 2011 Paper 1 Variant 1, question 38.

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