The nuclide notation ZAX{}^{A}_{Z}\text{X}ZAX describes the nucleus of an atom.
State what the symbol AAA represents.
State what the symbol ZZZ represents.
The activity of a sample of a radioactive nuclide is measured in January of certain years. In January 2010, the activity was 120 000 Bq120\,000\text{ Bq}120000 Bq. In January 2022, the activity was 15 000 Bq15\,000\text{ Bq}15000 Bq.
Show that the half-life of the nuclide is 4 years.
Determine the year when the activity of the sample was 7500 Bq7500\text{ Bq}7500 Bq.
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.