of black-body radiation from a source at temperature 
[P7.3, P10.1]
describes: the spectral brightness at wavelength of black-body radiation from a source at temperature [P7.3, P10.1]
is given by: 
where 
is Planck's constant, 
is the speed of light in a vacuum and 
is Boltzmann's constant. [P7.3]
is based: on the quantized interactions of electromagnetic waves in a cavity with the atoms in the walls, where the atoms are treated as oscillators with states of distinct energy. [P10.1]
Copyright 1997, The Open University