The table shows the count rates obtained from four radioactive sources. The measurements were taken at noon on four consecutive days.
| Source | Day 1 | Day 2 | Day 3 | Day 4 |
|---|---|---|---|---|
| A | 800 | 600 | 440 | 320 |
| B | 1600 | 804 | 401 | 198 |
| C | 120 | 118 | 115 | 112 |
| D | 500 | 125 | 31 | 8 |
Which source has the shortest half-life?
Source A
Source B
Source C
Source D
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.