A-LevelPhysicsSuperpositionFeb/Mar 2021Paper 1 Q281 Mark
Two sources of microwaves P and Q produce coherent waves with a phase difference of 180°. The waves have the same wavelength λ. [Figure 28.1] At the point S there is a minimum in the interference pattern produced by waves from the two sources. The distance (QS – PS) is called the path difference. Which expression could represent the path difference?
Aλ / 4
Bλ / 2
Cλ
D3λ / 2
✓ Correct Answer
The correct answer is C. This question tests the candidate's understanding of superposition within the Physicssyllabus. The examiner's mark scheme requires...
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Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
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