A-LevelPhysicsSuperposition9702/12 · May/June 2020 · Q291 Mark
The diagram shows an arrangement for demonstrating two-source interference using coherent light of a single wavelength λ. [Figure 29.1] An interference pattern is observed on a screen 3.0 m away from the slits X and Y, which have a separation of 1.0 mm. The central bright fringe is at Q, and the second bright fringe from the centre is at P. What is the distance between Q and P?
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
A6.0 × 10³ λ
B3.0 × 10³ λ
C6.7 × 10⁻⁴ λ
D3.3 × 10⁻⁴ λ
✓ Correct answer
A: 6.0 × 10³ λ
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