A-LevelPhysicsSuperposition9702/12 · Oct/Nov 2024 · Q301 Mark

The diagram shows visible light incident normally on a diffraction grating. [Figure 30.1] A pattern of intensity maxima forms on the screen. A line connecting the centre of the fourth order intensity maximum with the centre of the diffraction grating forms an angle of 53° with the centre line. The grating has a line spacing of 2.7 × 10⁻⁶ m. What is the wavelength of the incident light?

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A4.1 x 10⁻⁷ m

B5.4 × 10⁻⁷ m

C1.6 × 10⁻⁶ m

D2.2 × 10⁻⁶ m

✓ Correct answer

B: 5.4 × 10⁻⁷ m

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Topic: Superposition, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Oct/Nov 2024 Paper 1 Variant 2, question 30.

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