THE DOPPLER EFFECT
1 mark · EasyWhich observation provides evidence that the universe is expanding?
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Correct option: Red-shift of light from distant galaxies
Common mistakes: Choosing blue-shift or supernovae, which do not directly evidence expansion.
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Marking points
B1 · 1 mark · Correctly identifies red-shift as evidence for expansion.
Worked solution
The correct answer is 'Red-shift of light from distant galaxies', as this indicates that galaxies are moving apart, evidence for the expansion of the universe.