The count rate from a radioactive isotope is recorded every minute. The count rate is corrected for background radiation.
| Time / minutes | 0 | 1 | 2 | 3 | 4 | 5 |
|---|---|---|---|---|---|---|
| Corrected count rate / counts/s\text{counts/s}counts/s | 1200 | 990 | 820 | 670 | 550 | 460 |
What estimate of the half-life of the isotope can be obtained from the readings in the table?
between 1 and 2 minutes
between 2 and 3 minutes
between 3 and 4 minutes
between 4 and 5 minutes
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.