Chapter 11
Fundamentals of Thermal Radiation
Blackbody Radiation
1114C
A blackbody is a perfect emitter and absorber of radiation.
A blackbody does not actually exist.
It
is an idealized body that emits the maximum amount of radiation that can be emitted by a surface at a given
temperature.
1115C
Spectral blackbody emissive power
is the amount of radiation energy emitted by a blackbody at an
absolute temperature T per unit time, per unit surface area and per unit wavelength about wavelength
λ
.
The integration of the spectral blackbody emissive power over the entire wavelength spectrum gives the
total blackbody emissive power
,
∫
∞
=
=
0
4
)
(
)
(
T
d
T
E
T
E
b
b
σλ
λ
The spectral blackbody emissive power varies with wavelength, the total blackbody emissive power does
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This note was uploaded on 01/24/2012 for the course PHY 4803 taught by Professor Dr.danielarenas during the Fall '10 term at UNF.
 Fall '10
 Dr.DanielArenas
 Thermodynamics, Mass, Radiation

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