Superposition, coherence and interference Quiz
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5 questions, one answer each
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1. Two in-phase coherent sources emit waves of wavelength 0.30 m. At which path difference is there destructive interference?
- A. 0.30 m
- B. 0.60 m
- C. 0.45 m
- D. 0 m
2. What is the phase difference when the path difference is λ/4?
- A. π/4 rad
- B. π/2 rad
- C. π rad
- D. 2π rad
3. Which statement about coherent sources is correct?
- A. They are always in phase.
- B. They must have equal amplitudes.
- C. They have the same frequency and a constant phase difference.
- D. They must be of visible light.
4. Two waves of amplitude 3.0 cm meet in antiphase. What is the amplitude of the resultant?
- A. 6.0 cm
- B. 3.0 cm
- C. 1.5 cm
- D. 0 cm
5. Which describes a wavefront?
- A. A line joining points in antiphase
- B. A line joining points in phase
- C. A line along the direction of travel
- D. The distance between two crests