Exam-style question
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What is the reason that polarisation is considered evidence for transverse waves?.
Model answer
What a good answer should say
- Polarisation occurs when waves oscillate in a single plane.
- This is possible only for transverse waves, where the oscillations are perpendicular to the direction of wave travel.
- The ability to polarise light demonstrates that it is a transverse wave, as longitudinal waves cannot be polarised.
Explanation
Why this works
This answer is strong because it clearly identifies the cause (polarisation), explains the mechanism (oscillation in a single plane), states the effect (transverse nature of waves), and concludes with the consequence (evidence for transverse waves). The question tests understanding of wave properties and the distinction between wave types.
Common mistake
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