A computer simulation shows light travelling from two distant galaxies, C and D, to an observer on the Earth.
In the simulation, the light from both galaxies has longer wavelengths when it reaches the observer than when it left the galaxy.
The increase in wavelength is bigger for the light from galaxy D than for the light from galaxy C.
Give the name of this increase in the observed wavelength of light from a galaxy.
Which galaxy is further from the Earth?
Give a reason for your answer.
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.