Image: Kirchhof laws

Description: G. Kirchhof's three laws of spectroscopy: 1. A heated body of condensed matter or of dense hot gas radiates with continuous spectrum. 2. A heated gas of low pressure emits light with spectrum that consists of discrete narrow lines. 3. If a hot gas of low pressure is placed in the optical path of radiation of a hotter gas or a hot body of condensed matter, it creates absorption lines in the spectrum of emitting body. The position of these lines in the spectrum coincides with positions of emission lines of this same gas. The spectrum is made to approximately correspond to the spectrum of Sun, but intensities are only corresponding to real ones only by dichotomy "intense–less intense", as in the corresponding source file File:Fraunhofer_lines.svg.
Title: Kirchhof laws
Credit: See "Authors"
Author: This work is largely based on Figure 1.7 in the following book: Chromey, Frederick R. (2016) To Measure the Sky: An Introduction to Observational Astronomy, Cambridge University Press, p. 17 , which is monochrome and with arbitrary positions of lines. The spectrum of Sun is based on File:Solar_spectrum_en.svg by User:Nick84 The position of colours in the range 420–680 nm are from w:File:CIE_1976_UCS.png by User:Adoniscik, others are arbitrary. Fraunhofer lines are from the spectrum in File:Fraunhofer_lines.svg by User:Cepheiden (but this is derivative work by itself). The present derivative work: Esmu Igors, created with Inkscape.
Usage Terms: Creative Commons Attribution-Share Alike 4.0
License: CC BY-SA 4.0
License Link: https://creativecommons.org/licenses/by-sa/4.0
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