A-LevelPhysicsSuperposition9702/12 · May/June 2014 · 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?

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AOX = λ

BOX = λ/2

CS₂X - S₁X = λ

DS₂X - S₁X = λ/2

✓ Correct answer

D: S₂X - S₁X = λ/2

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Topic: Superposition, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, May/June 2014 Paper 1 Variant 2, question 27.

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