Edexcel IGCSE Physics 8 17p Galaxy Red Shift Questions
Compare measured wavelengths from galaxies to identify motion towards or away from Earth and compare recession speeds.
- Syllabus
- First assessment 2019
- Course
- Physics 4PH1
Exam points
- Describe red-shift as an increase in observed wavelength when a galaxy moves away from Earth.
- Compare whether galaxies move towards or away from Earth, and their relative speeds, from measured wavelengths.
- Relate greater galaxy distance to greater recession speed and red-shift, hence a longer observed wavelength.
Edexcel IGCSE Physics 8 17p Galaxy Red Shift Questions 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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