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NEST2021PhysicsWave Optics

Consider four identical monochromatic wave sources A , B , C , D (as shown in the figure) which produce plane waves of same wavelength . Sources A , B and C lie in a line, with B at the origin and A, C being 2 from the origin. Initially the source D is at a distance from the origin but later it is moved to a distance / 2 from the origin. Two receivers R₁ and R₂ are kept at equal large distance r from the origin. Sele

Options

  1. AIf source D is turned off, R₁ picks greater intensity signal than R₂ .
  2. BR₂ receives greater intensity signal when the source D is at distance .
  3. CSignal intensity at R₂ decreases 4 times when D is moved from to / 2 .
  4. DSignal intensity at R₁ is same whether D is at or / 2 .

Correct answer

D. Signal intensity at R₁ is same whether D is at or / 2 .

Step-by-step solution

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