Three electromagnetic waves are tested while travelling through a vacuum. The measured frequency and wavelength of each wave are shown in the table.
| wave | frequency in Hz | wavelength in m |
|---|---|---|
| A | 2.0 × 106 | 1.5 × 102 |
| B | 4.0 × 1012 | 7.4 × 10-5 |
| C | 8.0 × 1019 | 3.8 × 10-12 |
Calculate the speed of each wave. Evaluate whether the results support the statement that electromagnetic waves travel at the same speed through a vacuum.
84 exam-style questions on Edexcel GCSE Physics 5.2 The electromagnetic spectrum, covering 5.2.1 Electromagnetic waves and refraction in glass (core practical), 5.2.2 Groups of the electromagnetic spectrum, 5.2.3 Wavelength-dependent behaviour of EM waves, and 5.2.4 Velocities of EM waves in different substances. Each one has a worked solution and a mark scheme showing where the marks go.