A good absorber of a given wavelength of radiation is also a good emitter of that wavelength. Which of the following principles does this statement refer to?

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Quizplus · Accepted Answer

This statement refers to Kirchhoff's law, which states that a good absorber of a particular wavelength of radiation is also a good emitter of that same wavelength. Kirchhoff's law is a fundamental principle of spectroscopy and is widely used in astrophysics and remote sensing. The other laws listed are not directly related to this statement. The first law of thermodynamics is a general principle of energy conservation, Wien's law describes the wavelength distribution of blackbody radiation, and Stefan-Boltzmann's law relates the total amount of radiation emitted by a blackbody to its temperature.

A Good Absorber of a Given Wavelength of Radiation Is