A-LevelPhysicsSuperposition9702/12 · May/June 2013 · Q281 Mark

A teacher sets up the apparatus shown to demonstrate a two-slit interference pattern on the screen. [Figure showing a double-slit experiment setup with source, single slit, double slit, and screen, with distances p, q, r labeled] Which change to the apparatus will increase the fringe spacing?

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Adecreasing the distance p

Bdecreasing the distance q

Cdecreasing the distance r

Ddecreasing the wavelength of the light

✓ Correct answer

B: decreasing the distance q

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Topic: Superposition, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, May/June 2013 Paper 1 Variant 2, question 28.

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