alleryStart learning →According to Kirchhoff's law of thermal radiation, for a body in thermal equilibrium, emissivity equals what?
AIts reflectivity
BIts transmittance
CIts absorptivity
DIts temperature
Answer & Solution
Correct answer: C. Its absorptivity
Kirchhoff's law gives a = e, so a good absorber is also a good emitter at that wavelength.
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