A reading is taken every 8 hours of the number of emissions per second from a radioactive source. The table shows the readings:
| Time / hours | Number of emissions per second |
|---|---|
| 0 | 1600 |
| 8 | 1130 |
| 16 | 800 |
| 24 | 565 |
| 32 | 400 |
| 40 | 283 |
| 48 | 200 |
What is the half-life of the source?
8 hours
16 hours
24 hours
32 hours
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.