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O-LevelPhysicsWaves5054/12 · Oct/Nov 2025 · Q401 Mark

A teacher asks two students to describe redshift. Student 1 says: It is a decrease in the observed wavelength of electromagnetic radiation from stars. Student 2 says: It occurs because stars and galaxies move away from the Earth. Which students are correct?

Aboth student 1 and student 2

Bstudent 1 only

Cstudent 2 only

Dneither student 1 nor student 2

✓ Correct answer

C: student 2 only

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About this question

Topic: Waves, O-Level Physics (syllabus 5054). Multiple choice, 1 mark.
Source: O-Level Physics, Oct/Nov 2025 Paper 1 Variant 2, question 40.

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