A nucleus of oxygen-15 has the nuclide notation: 815O{}^{15}_{8}\text{O}815O.
Determine:
(i) the number of protons in one nucleus of oxygen-15.
(ii) the number of neutrons in one nucleus of oxygen-15.
(iii) the number of electrons in one neutral atom of oxygen-15.
A detector measures the radioactivity of a sample of oxygen-15.
The table below shows the record of count rates measured at regular intervals of 1 minute.
| Time (min\text{min}min) | Count rate (counts/s\text{counts/s}counts/s) |
|---|---|
| 0 | 400 |
| 1 | 283 |
| 2 | 200 |
| 3 | 141 |
| 4 | 100 |
| 5 | 71 |
| 6 | 50 |
Calculate the half-life of oxygen-15 using information from the table.
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.