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Question 30868
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Elasticity, Thermal Expansion, Calorimetry and Heat Transfer: Radiation MCQ

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RadiationMediumQuestion 30868

Question

A black body at temperature T₁ is surrounded by walls at T₂ (T₁ > T₂). Net power radiated is:
  1. A
    σA(T₁⁴ − T₂⁴)
    Correct
  2. B
    σA(T₁ − T₂)⁴
  3. C
    σAT₁⁴
  4. D
    σA(T₁² − T₂²)

Correct answer

σA(T₁⁴ − T₂⁴)

Explanation

Net radiation = emission − absorption = σA(T₁⁴ − T₂⁴).

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