A receiver records four different electromagnetic signals. The table gives the wavelength of each signal.
| Signal | Wavelength in m |
|---|---|
| P | 8.0 × 10⁻⁶ |
| Q | 2.5 |
| R | 3.0 × 10⁻⁷ |
| S | 4.0 × 10⁻² |
Which signal has the lowest frequency? Explain your answer.
93 exam-style questions on AQA GCSE Physics 6.2 Electromagnetic waves, covering 6.2.1 Types of electromagnetic waves, 6.2.2 Properties of electromagnetic waves 1, 6.2.3 Properties of electromagnetic waves 2, 6.2.4 Uses and applications of electromagnetic waves, 6.2.5 Lenses, and 6.2.6 Visible light. Each one has a worked solution and a mark scheme showing where the marks go.