Light from a receding galaxy is red-shifted when it reaches the Earth.
Which quantity has the same value for the received light as for the emitted light?
The wavelength of the light
The speed of the light
The frequency of the light
The energy of the light
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.