The wavelength which is radiated by an object depends on the object's temperature. The warmer the object, the shorter the wavelength. Warmer bodies radiate more energy than cooler bodies. The energy emitted from an object is proportional to the fourth root of the object's temperature. Good emitters are good absorbers at a particular wavelength.
Poor emitters are poor absorbers at the same wavelength.
Figure 4- Reflection, Absorption, Scattering, Refraction, and Transmission Radiative Transfer Radiation can be absorbed, reflected, scattered, refracted, or transmitted.