Which of the following statement is correct about heat transfer?

Which of the following statement is correct about heat transfer?

Right Answer is:

At thermal equilibrium, the emissivity and absorptivity are the same

SOLUTION

Kirchhoff’s law of thermal radiation states that the emissivity of a body is equal to its absorptivity when the body remains in thermal equilibrium with its surrounding.

Note:-  A blackbody allows all incident radiation to pass into it (no reflected energy) and internally absorbs all the incident radiation (no energy transmitted through the body).

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