EXPLANATORY NOTES ON PLANCKS LAW
“Plancks Law describes the electromagnetic radiation emitted by a black body in thermal equilibrium at a definite temperature. It is named after Max Planck who proposed it in 1900.”
Plancks Law tells us that as the temperature of any emitting surface increases, more and more energy will be released as Infrared energy. The higher the object temperature, the greater the amount of infrared energy will be produced.
As well as becoming more intense (Power) the emitted frequencies become wider and the peak wavelength becomes shorter. At very high temperatures not just infrared, but some shorter wavelength visible light will also be produced. This is first witnessed as a dull red glow, then to orange, yellow and finally white.
This is further discussed and explained as part of this paper.