Radiation Spectrum
(a) A graph of the spectra of electromagnetic waves emitted from an ideal radiator at three different temperatures. The intensity or rate of radiation emission increases dramatically with temperature, and the spectrum shifts toward the visible and ultraviolet parts of the spectrum. The shaded portion denotes the visible part of the spectrum. It is apparent that the shift toward the ultraviolet with temperature makes the visible appearance shift from red to white to blue as temperature increases. (b) Note the variations in color corresponding to variations in flame temperature.
Source
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"OpenStax College, College Physics. October 15, 2012."
http://cnx.org/content/m42230/latest/?collection=col11406/1.7
OpenStax CNX
CC BY 3.0.