Edexcel IGCSE Physics 8.17P Galaxy red-shift
Practise interpreting galaxy red-shift, comparing galaxy motion, and using distance data to predict wavelength and speed changes.
- Syllabus
- First assessment 2019
- Course
- Physics 4PH1
Exam points
- describe red-shift as increased wavelength when a galaxy moves away from Earth
- compare galaxy motions from red-shift and blue-shift evidence in spectra or data
- use distance from Earth to predict greater red-shift and higher recession speed
8.17P Galaxy red-shift question 1
[Maximum number: 2]
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).
Describe what is meant by the term red-shift.
- increase in wavelength of wave
- due to source / galaxy moving away from observer
Accept:
- decrease in frequency
- stretching wavelength
- observer moving away from source / galaxy
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