Which row in the table gives the approximate speeds at which radio waves travel in air and in a vacuum?
| Speed in air / m s−1\text{m s}^{-1}m s−1 | Speed in a vacuum / m s−1\text{m s}^{-1}m s−1 | |
|---|---|---|
| A | 340 | 3.0 × 108 |
| B | 3.0 × 108 | 340 |
| C | 3.0 × 108 | 3.0 × 108 |
| D | 340 | 340 |
Row A
Row B
Row C
Row D
198 exam-style questions on CIE IGCSE Physics Electromagnetic spectrum, covering Electromagnetic spectrum. Each one has a worked solution and a mark scheme showing where the marks go.