A laboratory analyses two beams of visible light travelling in a vacuum.
| Beam | Wavelength |
|---|---|
| P | 520 nm520\ \mathrm{nm}520 nm |
| Q | 470 nm470\ \mathrm{nm}470 nm |
The speed of electromagnetic waves in a vacuum is 3.0 × 108 m s-1.
1 nm=1×10−9 m1\ \mathrm{nm}=1\times10^{-9}\ \mathrm{m}1 nm=1×10−9 m
Calculate the frequency of beam P. Give your answer to two significant figures.
Beam P is green light. Explain whether beam Q is red light or blue light.
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.