Figure shows the line spectrum of hydrogen measured in a school laboratory, and the spectrum of the same hydrogen lines in the light received from two galaxies, A and B.
Figure

Use Figure to describe how the spectrum from galaxy B differs from the laboratory spectrum.
Galaxy A and galaxy B are at different distances from the Earth. Use Figure to determine which galaxy is further from the Earth. Give a reason for your answer.
41 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.