The table shows the contribution to background radiation from four common sources in a certain region:
| Source | Percentage of total background radiation (%) |
|---|---|
| Radon gas (in the air) | 47 |
| Medical uses | 15 |
| Cosmic rays | 12 |
| Food and drink | 10 |
Which percentage of background radiation comes from all other sources?
12%12\%12%
16%16\%16%
24%24\%24%
84%84\%84%
44 exam-style questions on CIE IGCSE Physics 5.2.1 Background radiation and measuring count rate. Each one has a worked solution and a mark scheme showing where the marks go.