A-LevelPhysicsSuperposition9702/12 · Oct/Nov 2021 · Q301 Mark
Light of wavelength 5.5 × 10⁻⁷ m is incident normally on a diffraction grating. [Figure 30.1] The angle between the second-order diffraction maxima is 80°, as shown. What is the number of lines per metre of the diffraction grating?
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.
A5.8 × 10⁵ lines per metre
B9.0 × 10⁵ lines per metre
C1.2 × 10⁶ lines per metre
D2.3 × 10⁶ lines per metre
✓ Correct answer
A: 5.8 × 10⁵ lines per metre
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