O-LevelPhysicsNuclear Physics5054/11 · Oct/Nov 2011 · Q391 Mark
The isotope barium-140 has a half-life of 13 days. A sample of this isotope is kept for 13 days. Which quantity halves during this time?
Athe number of atoms of barium-140 in the sample
Bthe number of electrons in an atom of barium-140
Cthe number of nucleons in an atom of barium-140
Dthe number of protons in a nucleus of barium-140
✓ Correct answer
A: the number of atoms of barium-140 in the sample
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