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.
484 exam-style questions on CIE IGCSE Physics 5.2 Radioactivity, covering 5.2.1 Background radiation and measuring count rate, 5.2.2a Alpha, beta and gamma emission, 5.2.2b Deflection and ionising effects of nuclear radiation, 5.2.3a Radioactive decay, 5.2.3b Effects of decay on the nucleus and decay equations, 5.2.4a Half-life, 5.2.4b Choosing isotopes for applications, and 5.2.5 Effects of ionising radiation and safety precautions. Each one has a worked solution and a mark scheme showing where the marks go.