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MHT CET202013 Oct 2020Evening ShiftPhysicsThermal Properties of MatterActual

respectively. If they are coated with a material of same emissivity, rate of radiation of ^ S ₁ ^ is E then rate of radiation of S ₂ ^ is (spheres are of the same material)

Options

  1. AE 6 .
  2. BE 3 .
  3. CE 9 .
  4. DE 12 .

Correct answer

C. E 9 .

Step-by-step solution

array l E = 4 R ² T ⁴ E ^ = 4 (3 R )² ( T 3 )⁴ E ^ E = (3)² (3)⁴ =9 E ^ =9 E . array

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