What does the red-shift of light from distant galaxies show?
Answer and explanation
Correct answer: A. The galaxies are moving away from us
- Step 1: Wavelengths are stretched. Step 2. Further galaxies show greater red-shift. Answer: The galaxies are moving away from us, so the Universe is expanding. Why not the others: Blue-shift would show approach.
Practise more Atomic Physics Space and Magnetism.
Free questions with an explanation for every one, and full timed UK GCSE mock tests.
More Atomic Physics Space and Magnetism questions
- What is the relative charge of an electron?
- Which type of radiation is stopped by a sheet of paper?
- A radioactive source has a half-life of 6 hours. What fraction of the nuclei remains after 24 hours?
- Which is the best definition of nuclear fission?
- What is the name of the force that keeps planets in orbit around the Sun?
- What is the Big Bang theory?