Diffraction and diffraction gratings Quiz
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5 questions, one answer each
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1. A diffraction grating has 400 lines per mm. What is the slit spacing?
- A. 4.0 × 10⁻⁷ m
- B. 2.5 × 10⁻³ m
- C. 2.5 × 10⁻⁶ m
- D. 4.0 × 10⁵ m
2. Light of wavelength 500 nm is incident on a grating of spacing 2.0 × 10⁻⁶ m. What is the angle of the first-order maximum?
- A. 75.5°
- B. 14.5°
- C. 25.0°
- D. 30.0°
3. Which change makes diffraction at a single gap more pronounced?
- A. Increasing the wavelength
- B. Widening the gap
- C. Decreasing the wavelength
- D. Increasing the wave speed
4. With white light, which colour of the first-order spectrum is closest to the central maximum?
- A. Red
- B. Green
- C. Yellow
- D. Violet
5. Light of wavelength 600 nm is passed through a grating of spacing 2.7 × 10⁻⁶ m. What is the highest order that can be observed?
- A. 3
- B. 4
- C. 5
- D. 2