Radioactive phosphorus-32 emits β\betaβ-particles and has a half-life of 14 days. It decays to produce sulfur-32. Which statement about this decay is correct?
After 14 days no more β\betaβ-particles are emitted.
After 14 days the number of sulfur-32 atoms has halved.
After 28 days the phosphorus-32 has decayed completely.
After 28 days the number of phosphorus-32 atoms has reduced to one quarter of its initial value.
144 exam-style questions on CIE IGCSE Physics 5.2.4a Half-life. Each one has a worked solution and a mark scheme showing where the marks go.