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NEET2026PhysicsChapterActual

Sustained interference fringes can be formed by the superposition of which of the following light waves? A. E = E₀ (kx - t) B. E = E₀ (2kx - 2 t) C. E = E₀ (kx - t + 4 ) D. E = E₀ (kx - 3 t) Choose the correct answer from the options given below.

Options

  1. AA and B
  2. BB and D
  3. CA and C
  4. DC and D

Correct answer

C. A and C

Step-by-step solution

For sustained interference fringes, the superposing light waves must be coherent. Coherent waves must have the same frequency (or angular frequency ) and a constant phase difference. From the given equations: Angular frequency of wave A is . Angular frequency of wave B is 2 . Angular frequency of wave C is . Angular frequency of wave D is 3 . Waves A and C have the same angular frequency . Therefore, the superposition of waves A and C will form sustained interference fringes. Answer: A and C

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