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Printable version; Page information ... Size of this JPG preview of this PDF file: 423 × ... Figure 1-4 Electromagnetic spectrum diagram from The Army Institute for ...
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Note: Information in the chart has been superseded by the information in File:United States Frequency Allocations Chart 2016 - The Radio Spectrum.pdf, which was downloaded from the US Department of Commerce web site and archived at archive.org.
The spectrum appears in a series of lines called the line spectrum. This line spectrum is called an atomic spectrum when it originates from an atom in elemental form. Each element has a different atomic spectrum. The production of line spectra by the atoms of an element indicate that an atom can radiate only a certain amount of energy.
Several elements, including helium, thallium, and caesium, were discovered by spectroscopic means. Spectral lines also depend on the temperature and density of the material, so they are widely used to determine the physical conditions of stars and other celestial bodies that cannot be analyzed by other means.
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In physics, atomic spectroscopy is the study of the electromagnetic radiation absorbed and emitted by atoms.Since unique elements have unique emission spectra, atomic spectroscopy is applied for determination of elemental compositions.