O-LevelPhysicsNuclear Physics5054/12 · Oct/Nov 2017 · Q371 Mark
A sample contains atoms of an isotope that has a half-life of 7.2 years. Which quantity halves every 7.2 years?
Athe mass of the sample
Bthe nucleon (mass) number
Cthe number of atoms of the isotope
Dthe proton (atomic) number
✓ Correct answer
C: the number of atoms of the isotope
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