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O-LevelPhysicsLight5054/11 · Oct/Nov 2023 · Q401 Mark

What is the definition of redshift?

Athe increase in observed frequency of light from galaxies that are moving away from the Earth

Bthe increase in observed wavelength of light from galaxies that are moving away from the Earth

Cthe light emitted by distant galaxies that is blue when it reaches the Earth

Dthe light reaching the Earth that is red when it is emitted by distant galaxies

✓ Correct answer

B: the increase in observed wavelength of light from galaxies that are moving away from the Earth

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Topic: Light, O-Level Physics (syllabus 5054). Multiple choice, 1 mark.
Source: O-Level Physics, Oct/Nov 2023 Paper 1 Variant 1, question 40.

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