What is the Planckâs law?
As mentioned in FAQ section, the quantity of energy emitted by a true blackbody only depends on its temperature. This radiation level, named Radiant Emittance R, is defined by the following distribution discovered in 1900 by the German scientist, Max Planck:
- h is the Planckâs constant, h=6.626 x 1034 Js
- K is the Boltzmannâs constant, K=1.381 x 10-23 J/K
- c is the speed of light, c=2.998 x 108 m/s
- Î» is the wavelength (in meters)
- T is the temperature of the blackbody in Kelvin: T (Kelvin) = 273,16 + t (Celsius degree).
Download our calculation sheet to determine the energy emitted by a true blackbody at selected wavelengths, depending on the temperature of the blackbody.