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Question 30898
JEE Physics · Hard

Elasticity, Thermal Expansion, Calorimetry and Heat Transfer: Calorimetry Advanced MCQ

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Calorimetry AdvancedHardQuestion 30898

Question

Kirchhoff's law of radiation states:
  1. A
    All bodies radiate equally
  2. B
    Good absorbers are good emitters at same temperature
    Correct
  3. C
    Radiation increases with pressure
  4. D
    Emissivity equals reflectivity

Correct answer

Good absorbers are good emitters at same temperature

Explanation

Kirchhoff's law: absorptivity = emissivity at every wavelength and temperature. So a good absorber (like a black body) is also a good emitter.

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