State how a neutral atom becomes a negative ion.
State the type of nuclear emission which is the most penetrating.
Isotopes of chlorine (Cl\text{Cl}Cl) include: Cl−35\text{Cl}-35Cl−35 and Cl−37\text{Cl}-37Cl−37. Explain what is meant by 'isotopes of chlorine'.
A teacher provides the data in the table below about the decay of a radioactive sample.
| Time, ttt (s\text{s}s) | Count rate (counts/s\text{counts/s}counts/s) |
|---|---|
| 000 | 400400400 |
| 151515 | 300300300 |
| 353535 | 200200200 |
| 505050 | 150150150 |
| 707070 | 100100100 |
| 858585 | 757575 |
Use the information in the table to determine the half-life of the radioactive sample.
Describe one precaution that should be taken when handling radioactive sources to minimise exposure.
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.