A-LevelPhysicsSuperpositionMay/June 2014Paper 1 Q271 Mark
The diagram shows an experiment which has been set up to demonstrate two-source interference. Microwaves of wavelength λ pass through two slits S₁ and S₂. [Figure 27.1] The detector is moved from point O in the direction of the arrow. The signal detected decreases until the detector reaches point X, and then starts to increase again as the detector moves beyond X. Which equation correctly determines the position of X?
AOX = λ
BOX = λ/2
CS₂X - S₁X = λ
DS₂X - S₁X = λ/2
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The correct answer is D. 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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