Emissive Power for a Blackbody over a Range of Wavelengths
This Demonstration shows the emissive power for a blackbody over a range of wavelengths, represented by the area under the curve between values and .[more]
Planck’s blackbody radiation law gives the spectral density emitted by a blackbody as a function of wavelength and temperature:
is the absolute temperature of the body, K.
is the first radiation constant: .
is the second radiation constant: m K.
The fraction of the total blackbody emission in a spectral band between wavelengths and , at temperature , is given by the integral:[less]
 F. Kreith, R. Manglik and M. Bohn, Principles of Heat Transfer, 7th ed., Stamford, CT: Cengage Learning, 2011.