"The ratio of the total emissive power to the absorptivity for all bodies is same at ther-mal equilibrium". This is ______________ law?
Correct answer: C. Kirchoff's
- A. Wien's displacement
- B. Planck's
- C. Kirchoff's
- D. Stefan-Boltzmann
Explanation
Kirchhoff's law states that at thermal equilibrium, emissive power divided by absorptivity is the same for bodies at the same temperature. Planck's and Stefan-Boltzmann's laws describe spectral and total blackbody emission, respectively.
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