A student finds a table showing data for different ultraviolet (UV) radiation bands:
| Radiation Band | Wavelength Range | % Energy Absorbed by the Earth's Atmosphere |
|---|---|---|
| Near UV | 400 nm400\text{ nm}400 nm to 300 nm300\text{ nm}300 nm | 10% |
| Middle UV | 300 nm300\text{ nm}300 nm to 200 nm200\text{ nm}200 nm | 90% |
| Far UV | 200 nm200\text{ nm}200 nm to 10 nm10 \text{ nm}10 nm | 100% |
Using the data in the table, explain why Far UV is potentially the most dangerous type of ultraviolet radiation to human cells, but does not pose a risk to people on the Earth's surface.
25 exam-style questions on Edexcel GCSE Physics 5.4 Uses and dangers of EM radiation, covering 5.4.1 Dangers of electromagnetic radiation, 5.4.2 Uses of electromagnetic radiation, 5.4.3 Radio waves and oscillations in circuits, and 5.4.4 Changes in atoms and nuclei generating radiation. Each one has a worked solution and a mark scheme showing where the marks go.