Interference and Young's double-slit experiment Quiz
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5 questions, one answer each
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1. Two in-phase sources are 2.0 wavelengths further from a point on one side than on the other. What is observed?
- A. A minimum
- B. A maximum
- C. Half the maximum amplitude
- D. Nothing; it is not possible to say
2. In a double-slit experiment with red light the fringe spacing is 3.0 mm. What is it with the same set-up but light of half the wavelength?
- A. 6.0 mm
- B. 3.0 mm
- C. 1.5 mm
- D. 0.75 mm
3. Which is a reason that two separate torches do not produce an interference pattern?
- A. The light is too bright
- B. Their light is not coherent
- C. The torches are too small
- D. Light cannot interfere
4. A double slit of separation 0.50 mm is 1.0 m from a screen. The fringe spacing is 1.2 mm. What is the wavelength?
- A. 6.0 × 10⁻⁷ m
- B. 2.4 × 10⁻⁶ m
- C. 6.0 × 10⁻⁴ m
- D. 1.2 × 10⁻³ m
5. In a double-slit experiment with white light, which colour appears closest to the central white fringe in the first-order spectrum?
- A. Red
- B. Green
- C. Yellow
- D. Violet