A science archive contains two independent records.
| Record | Measurements |
|---|---|
| A | The wavelength of an absorption line is 486 nm486\ \mathrm{nm}486 nm in a laboratory. Its wavelength is 490 nm490\ \mathrm{nm}490 nm for a nearer galaxy, 498 nm498\ \mathrm{nm}498 nm for a more distant galaxy and 510 nm510\ \mathrm{nm}510 nm for the most distant galaxy. |
| B | Weak radiation from apparently empty regions of the sky is strongest at a wavelength of 1.1 mm. Its intensity is almost the same in every direction. |
Evaluate which record can distinguish the Big Bang theory from the Steady State theory.
94 exam-style questions on Edexcel GCSE Physics 7.2 The Universe and red-shift, covering 7.2.1 Big Bang and Steady State theories, 7.2.2 Evidence for the Big Bang, 7.2.3 The Doppler effect and red-shift, 7.2.4 Red-shift as evidence for an expanding Universe, and 7.2.5 The CMB and the accepted model. Each one has a worked solution and a mark scheme showing where the marks go.