Cosmic Microwave Background (CMB) radiation is a key piece of observational evidence supporting the Big Bang theory of the expanding Universe.
Table 1 shows typical frequencies for different regions of the electromagnetic spectrum.
| Type of radiation | Typical frequency |
|---|---|
| Gamma rays | 3.0 × 1020 Hz |
| X-rays | 2.0 × 1017 Hz |
| Ultraviolet | 1.0 × 1015 Hz |
| Visible | 6.0 × 1014 Hz |
| Infrared | 3.0 × 1013 Hz |
| Microwaves | 1.5 × 1011 Hz |
| Radio waves | 2.0 × 107 Hz |
Use Table 1 to state a typical value for the frequency of CMB radiation, justifying your choice.
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.