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COMEDK2012PhysicsWaves and Sound

In an interference pattern the ratio of the intensity of light at the bright fringe to that at the dark fringe is 9: 1 . Then, the ratio of the amplitudes of the two interfering waves

Options

  1. A3: 1
  2. B2: 1
  3. C1: 4
  4. D5: 4

Correct answer

B. 2: 1

Step-by-step solution

Given, I_ I_ =9 Since, intensity ( amplitude )² A_ A_ = a₁+a₂ a₁-a₂ = 9 1 = 3 1 a₁+a₂=3 a₁-3 a₂ 2 a₁=4 a₂ a₁: a₂=2: 1

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