Physics (AS & A Level) · May / June 2025 · Paper 14 · Question 28
An electromagnetic wave is incident normally on a diffraction grating. A second-order maximum is produced at an angle of 30° to the direction of the incident light. The grating has 5000 lines per cm. What is the wavelength of the wave?
- A2.5 × 10⁻⁷ m
- B5.0 × 10⁻⁷ m
- C1.0 × 10⁻⁶ m
- D5.0 × 10⁻⁵ m
As printed in the paper
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Correct answer: B. 5.0 × 10⁻⁷ m
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