Edexcel IGCSE Physics 8 18p Expansion of the Universe Questions
Read wavelength-change or recession-speed graphs and relate the trend to galaxies being closer together in the past.
- Syllabus
- First assessment 2019
- Course
- Physics 4PH1
Exam points
- interpret a graph showing wavelength change or velocity increasing with distance
- explain that greater red-shift in distant galaxies shows the universe is expanding
- link galaxies moving apart now to matter being closer together in the past
Edexcel IGCSE Physics 8 18p Expansion of the Universe Questions question 1
Between 1929 and 1931, physicists Hubble and Humason investigated the red-shift of light from galaxies at different distances from the Earth.
The distance unit they used is the megaparsec (Mpc).
The graph shows some of the results of their investigation.
Explain why the graph from Hubble's investigation provides evidence for the expansion of the universe.
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