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.
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.