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Physics · Oct / Nov 2017 · Paper 12 · Question 37

5054Half-life

A sample contains atoms of an isotope that has a half-life of 7.2 years. Which quantity halves every 7.2 years?

  1. Athe mass of the sample
  2. Bthe nucleon (mass) number
  3. Cthe number of atoms of the isotope
  4. Dthe proton (atomic) number

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Correct answer: C. the number of atoms of the isotope

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