The count rate from a radioactive isotope is recorded every two days. The count rate is corrected for background radiation.
The table shows the readings.
| Time / days | 0 | 2 | 4 | 6 | 8 | 10 |
|---|---|---|---|---|---|---|
| Corrected count rate / (counts / s) | 1200 | 910 | 690 | 520 | 390 | 300 |
What estimate of the half-life of the isotope can be obtained from the readings in the table?
between 2 and 4 days
between 4 and 6 days
between 6 and 8 days
between 8 and 10 days
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.