Radioactive decay is a random process, but the half-life of an isotope has a fixed value.
Explain the concept of half-life and how it is related to the random nature of radioactive decay.
A student writes 'after two half-lives every nucleus in the sample will have decayed'. Explain why the student is wrong.
40 exam-style questions on AQA GCSE Physics 4.2 Atoms and nuclear radiation, covering 4.2.1 Radioactive decay and nuclear radiation, 4.2.2 Nuclear equations, 4.2.3 Half-lives and the random nature of radioactive decay, and 4.2.4 Radioactive contamination. Each one has a worked solution and a mark scheme showing where the marks go.