The half-life of a radioactive nuclide is 3.0 hours3.0\text{ hours}3.0 hours.
The decay rate of a sample of this nuclide is measured at 1.5 hour1.5\text{ hour}1.5 hour intervals. The table shows the measurements, with one value shown as XXX.
| Time (hours) | Decay rate (decays / s) |
|---|---|
| 0 | 320 |
| 1.5 | 226 |
| 3.0 | 160 |
| 4.5 | 113 |
| 6.0 | XXX |
What is the most likely value of XXX?
404040
565656
808080
113113113
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.