Two sources of light are coherent if they emit rays of_______________?
Correct answer: C. same wave length with constant phase difference
- A. same wavelength
- B. same amplitude of vibration
- C. same wave length with constant phase difference
- D. same amplitude and wavelength
Explanation
Coherent sources have the same frequency or wavelength and maintain a constant phase difference, which keeps the interference pattern steady. Students may choose a because equal wavelength is necessary, but it is not sufficient without a constant phase difference.
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About Superposition and Interference
Superposition states that overlapping waves produce a resultant displacement equal to the algebraic sum of their individual displacements. Interference covers constructive and destructive interference, phase difference, path difference, coherent sources, and conditions for maxima and minima. It differs from diffraction, which involves spreading around openings or obstacles.
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