Thermal Radiation at Different Temperatures

Thermal Radiation at Different Temperatures

. The spectral plot of thermal radiation intensity as a function of wavelength depends on the temperature of the gas emitting the radiation. At higher temperatures the wavelength of peak emission shifts to shorter wavelengths, and the thermal radiation intensity becomes greater at all wavelengths. At a temperature of 6,000 degrees Kelvin, or 6,000 oK, the thermal radiation peaks in the visible, or V, band of wavelengths. A hot gas with a temperature of 100,000 oK emits most of its thermal radiation at ultraviolet, or UV, wavelengths, while the emission peaks in X-rays when the temperature is 1 to 10 million oK.

Copyright 2010, Professor Kenneth R. Lang, Tufts University