A computer program identifies the same spectral line produced by an element in light from three galaxies. In a laboratory, this line has a wavelength of 500 nm.
| Galaxy | Distance from the Earth in million light-years | Observed wavelength in nm |
|---|---|---|
| A | 300 | 511 |
| B | 900 | 533 |
| C | 1800 | 566 |
Explain how the measurements provide evidence for the Big Bang theory.
A later measurement shows that the same spectral line has a wavelength of 507 nm in light from a galaxy 1500 million light-years away.
Explain how this new result could affect scientists' view of the Big Bang theory.
79 exam-style questions on AQA GCSE Physics 8.2 Red-shift, covering 8.2 Red-shift. Each one has a worked solution and a mark scheme showing where the marks go.