A scientist measures the activity of isotope X.
She starts taking activity measurements after 15 minutes.
The table below shows her results for isotope X.
| Time (minutes) | Activity (counts per second) |
|---|---|
| 0 | |
| 5 | |
| 10 | |
| 15 | 118 |
| 20 | 100 |
| 25 | 83 |
| 30 | 70 |
| 35 | 59 |
| 40 | 50 |
| 45 | 41 |
| 50 | 35 |
| 55 | 29 |
| 60 | 25 |
Predict the activity of isotope X at 0 minutes.
Use the information in the table to help you.
41 exam-style questions on OCR GCSE Physics Radioactive emissions. Each one has a worked solution and a mark scheme showing where the marks go.