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MHT CET2017PhysicsWaves and Sound

Two identical light waves having phase difference ϕ propagate in the same direction. When they superpose, the intensity of the resultant wave is proportional to

Options

  1. Acos 2 ⁡ ϕ
  2. Bcos 2 ⁡ ϕ 2
  3. Ccos 2 ⁡ ϕ 3
  4. Dcos 2 ⁡ ϕ 4

Correct answer

B. cos 2 ⁡ ϕ 2

Step-by-step solution

For two identical light waves I R = 4 I cos 2 ⁡ ϕ 2 ∴ I R ∝ cos 2 ⁡ ϕ 2

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