Define Kirchhoff's law of radiation.

Asked on by sha11

1 Answer | Add Yours

giorgiana1976's profile pic

giorgiana1976 | College Teacher | (Level 3) Valedictorian

Posted on

Kirchhoff's Law refers to the fact that all bodies own the quality of emission and absorption. At a given temperature (T), in conditions of thermodynamic equilibrium, the ratio of capacity of energy  and capacity of absorption of a certain body is a constant value, equal to the capacity of emission of the absolute black body, both, for radiation with a specific wavelength and for the total radiation with different wavelengths.

Kirchhoff's law leads to the following conclusions: a body that is a good absorber is also a good radiant.

The perfect black body absorbs all of the amount of radiant energy that falls on its surface. His capacity of absorption is equal to 1.

We’ve answered 319,865 questions. We can answer yours, too.

Ask a question