is given by Planck's function:
is: electromagnetic radiation emitted by a black-body. [P8.2, P10.1]
has: a characteristic spectrum whose spectral brightness at wavelength is given by Planck's function:
with an overall shape, a wavelength for peak emission, and a total radiated power per unit surface area all determined entirely by the temperature of the black-body. [P7.3, P8.2, P10.1]
is also found: within a cavity in thermodynamic equilibrium. [P8.2, P10.1]
therefore can be realized in practice: by using a cavity with a small aperture. [P8.2, P10.1]
Copyright 1997, The Open University