Which row in the table correctly describes the changes in proton number, ZZZ, and nucleon number, AAA, of a nucleus undergoing radioactive decay?
| Type of decay | Change in proton number (ZZZ) | Change in nucleon number (AAA) | |
|---|---|---|---|
| A | α \alpha\,α decay | decreases by 4 | decreases by 2 |
| B | β−\beta^-β− decay | increases by 1 | no change |
| C | γ \gamma\,γ emission | decreases by 1 | no change |
| D | β−\beta^-β− decay | decreases by 1 | decreases by 1 |
Row A
Row B
Row C
Row D
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.