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O-LevelPhysicsNuclear Physics5054/12 · May/June 2016 · Q391 Mark

Which statement about the half-life of a radioactive isotope is correct?

AHalf-life changes as the isotope decays.
BHalf-life is the time it takes for the nucleon number of the isotope to halve.
CHalf-life is half the time it takes for the number of nuclei of the isotope to decrease to zero.
DHalf-life is the time it takes for the number of nuclei of the isotope to decrease by half.

✓ Correct answer

D: Half-life is the time it takes for the number of nuclei of the isotope to decrease by half.

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About this question

Topic
Nuclear Physics, O-Level Physics (syllabus 5054). Multiple choice, 1 mark.
Source
O-Level Physics, May/June 2016 Paper 1 Variant 2, question 39.

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