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MHT CET202012 Oct 2020Morning ShiftPhysicsThermal Properties of MatterActual

Two spheres ' S ₁ ' and ' S ₂ ' have same radii but temperatures T ₁ and T ₂ respectively. Their emissive power is same and emissivity is in the ratio 1: 4 . Then the ratio of T ₁ to T ₂ is

Options

  1. A2 : 1
  2. B1: 2
  3. C2: 1
  4. D1: 2

Correct answer

A. 2 : 1

Step-by-step solution

Emissive power P= e T⁴ array l e₁ T₁⁴= e₂ T₂⁴ T₁⁴ T₂⁴ = e₂ e₁ =4 T₁ T₂ = 2 array

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