P6__Waves Matt Black surfaces area the best absorbers and emitters of infrared radiation. Hotter objects emit more infrared radiation in a given time.
Both the wavelength and intensity of radiation depend on the temperature of the object.
- Hot objects emit more short wavelength
- Hot objects emit more intense radiation
A Perfect Black Body absorbs all infrared incident upon it. It is also the best emitter of infrared radiation.
If an object is hotter than it’s surroundings then it will emit more infrared then it absorbs and will decrease in temperature. Vice versa for cold. If it is at a constant temperature then it will emit and absorb at the same rate.