Cosmic Microwave Background (CMB) radiation provides vital evidence about the early history of the Universe.
Table 1 shows typical wavelengths for different regions of the electromagnetic spectrum.
| Type of radiation | Typical wavelength |
|---|---|
| Gamma rays | 3.0 × 10-13 m |
| X-rays | 1.5 × 10-11 m |
| Ultraviolet | 320 nm320\text{ nm}320 nm |
| Visible | 500 nm500\text{ nm}500 nm |
| Infrared | 8.0 μm8.0\ \mu\text{m}8.0 μm |
| Microwaves | 2.0 mm |
| Radio waves | 120 m |
Use Table 1 to give a typical value for the wavelength of CMB radiation, explaining your answer.
53 exam-style questions on Edexcel GCSE Physics 7.2 The Universe and red-shift. Each one has a worked solution and a mark scheme showing where the marks go.