2) Stefan-Boltzmann law
The total emitted radiation (Mλ) from a blackbody is proportional to the fourth
power of its absolute temperature and is expressed as:
Thus, the amount of energy emitted by an object such as the Sun (6000°K) or the
Earth (300°K) is a function of its temperature.
Stefan-Boltzmann law tells us that the energy density depends only on the
temperature, and specifically on the fourth power of the temperature
3) Wein's displacement law
In addition it can be determine dominant wavelength (λ max) of maximum
radiance intensity occur (at temperature: T).
Wien’s displacement law tells us at what wavelength the object have radiance at
maximum intensity
14
M σT4 watt/m2
μm
T
λ 2898 max
where σ is the Stefan-Boltzmann
constant, 5.6697 x 10 -8 Watt/(m2 K4)