A-LevelPhysicsNuclear physics9702/12 · Oct/Nov 2012 · Q391 Mark
A material contains a radioactive isotope that disintegrates solely by the emission of α-particles at a rate of 100 s⁻¹. Which statement about this material is correct?
AThe number of atoms in the material diminishes at a rate of 100 s⁻¹.
BThe number of neutrons in the material diminishes at a rate of 100 s⁻¹.
CThe number of nucleons in the material diminishes at a rate of 400 s⁻¹.
DThe number of protons in the material diminishes at a rate of 100 s⁻¹.
✓ Correct answer
C: The number of nucleons in the material diminishes at a rate of 400 s⁻¹.
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