Saurabh Koranglekar
Last Activity: 4 Years ago
Depending on the nature of surfaces the incident radiation falling on the body are either absorbed or reflected. The substances which absorbs more energy that they reflect are known as good absorbers.
Rough surfaces are good absorbers as they absorb more incident radiations while highly mirror polished surfaces reflects more incident radiations, thus they are bad absorbers.
Also, every hot body emits heat radiations from its surface. These radiations depend on nature of the surface, its size and surroundings of the body. The body which emit such radiations is known as Radiator.
A good absorber is a good radiator and a bad absorber is a bad radiator. e.g a black body is one which absorbs all the radiation incident on it and after absorbing the incident radiations.
Black surfaces appear black in colour, independent of the colour of incident radiations. Thus they are better absorbers and radiators than white surfaces.
Therefore, highly polished mirror like surfaces are bad radiators.
