The table shows the activity, in Bq\text{Bq}Bq, 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 | 780 | 762 | 745 |
| B | 400 | 283 | 200 | 141 |
| C | 600 | 300 | 150 | 75 |
| D | 1000 | 250 | 62 | 16 |
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.