Edexcel IGCSE Physics 8 14p Big Bang Evidence Questions
Explain what CMBR shows about the early universe and how redshift indicates that galaxies are moving away.
- Syllabus
- First assessment 2019
- Course
- Physics 4PH1
Exam points
- name CMBR and cosmological red-shift as evidence supporting the Big Bang theory
- explain how CMBR wavelength increasing links to expansion and a cooler universe
- use galaxy red-shift to show distant galaxies moving away from an earlier single point
Edexcel IGCSE Physics 8 14p Big Bang Evidence Questions question 1
[Maximum number: 4]
The Big Bang theory suggests that the Universe is approximately 14 billion years old.
Describe the evidence that supports the Big Bang theory.
Any four from:
- presence of cosmic microwave background radiation
- CMBR comes from all directions
- CMBR began as gamma radiation and wavelength increased as the Universe expanded
- red-shift of galaxies
- further / faster galaxies show a greater red-shift
- red-shift indicates that galaxies are moving away from each other
- relative abundance of helium
- helium formed when the Universe was hot enough to fuse protons
Accept:
- CMBR
- CMBR is uniform
- large amount of helium
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