The following is the Planck's derivation for black body radiation
$${\rho}({\lambda}) d{\lambda}=E({\lambda})*f({E(\lambda}))*D({\lambda})d{\lambda}------equation 1$$
$$\int_0^\infty{\rho}({\lambda})d{\lambda}$$ is the density of radiative energy.
From
http://en.wikipedia.org/wiki/Stefan–...Planck.27s_law
"..... is the amount of energy per unit surface area per unit time per unit solid angle emitted at a frequency by a black body at temperature T." From Wikipedia .
How should I derive the I(v,T) from Planck's law? Please help .thanks
$${\rho}({\lambda}) d{\lambda}=E({\lambda})*f({E(\lambda}))*D({\lambda})d{\lambda}------equation 1$$
$$\int_0^\infty{\rho}({\lambda})d{\lambda}$$ is the density of radiative energy.
From
http://en.wikipedia.org/wiki/Stefan–...Planck.27s_law
"..... is the amount of energy per unit surface area per unit time per unit solid angle emitted at a frequency by a black body at temperature T." From Wikipedia .
How should I derive the I(v,T) from Planck's law? Please help .thanks