A sample of a radioactive isotope is monitored in a laboratory. The count rate is measured every 4 hours, and the results are shown in the table below.
| Time / hours | 0 | 4 | 8 | 12 | 16 | 20 | 24 | 28 |
|---|---|---|---|---|---|---|---|---|
| Count rate / cpm | 4000 | 2800 | 2000 | 1400 | 1350 | 710 | 500 | 350 |
One of the readings is incorrect due to an experimental error.
Identify the anomalous reading in the table and estimate what the correct count rate should be for that time.
Determine the half-life of the radioactive isotope.
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.