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2016 · M/J · 5054/12 | Q39

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CIE-5054-2016-MJ-p12 · Question 39

May/June 2016 Physics 5054/12: 40 multiple-choice questions, one mark each. No mark is deducted for a wrong answer. Electronic calculators may be used. Question 35 covers historical syllabus content and is available in this paper only, not current-topic practice.
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39 Which statement about the half-life of a radioactive isotope is correct? A Half-life changes as the isotope decays. B Half-life is the time it takes for the nucleon number of the isotope to halve. C Half-life is half the time it takes for the number of nuclei of the isotope to decrease to zero. D Half-life is the time it takes for the number of nuclei of the isotope to decrease by half.

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5054/12/M/J/16Cambridge O Level Physics 5054 · May/June 2016 · Paper 1 variant 2 · Question 39