fundamental work by kirchhoff on black body radiation (a term he introduced in 1862) was important in the development of quantum theory . fraunhofer had observed bright lines in the spectrum produced by flames and noted that they appeared at similar frequencies to certain dark lines in the spectrum of the sun.
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Fundamental work by Kirchhoff on black body radiation (a term he introduced in 1862) was important in the development of quantum theory . Fraunhofer had observed bright lines in the spectrum produced by flames and noted that they appeared at similar frequencies to certain dark lines in the spectrum of the sun.