A-LevelPhysicsSuperposition9702/12 · Oct/Nov 2019 · Q281 Mark
An electromagnetic wave is incident normally on a diffraction grating. A second-order maximum is produced at an angle of 30° to a normal to the grating. 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
✓ Correct answer
B: 5.0 × 10⁻⁷ m
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