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2018 · M/J · 5054/11 | Q38

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CIE-5054-2018-MJ-p11 · Question 38

May/June 2018 Physics 5054/11: 40 multiple-choice questions, one mark each. No mark is deducted for a wrong answer. Electronic calculators may be used.
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38 A radioactive isotope of hydrogen has a half-life of 12 years. A sample contains 40 million atoms of this isotope. How many atoms of this isotope are left after 24 years? A 20 million B 10 million C 5 million D zero

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5054/11/M/J/18Cambridge O Level Physics 5054 · May/June 2018 · Paper 1 variant 1 · Question 38