EVERYDAY SCIENCE

Detailed explanation-1: -A black body is a perfect theoretical radiator that absorbs 100% of all electromagnetic radiation that hits it. No electromagnetic radiation passes through it and none is reflected. The object appears completely black when it is cold because no light (visible electromagnetic radiation) is reflected or transmitted.

Detailed explanation-2: -If an object absorbs electromagnetic energy of a certain wavelength, it will also emit energy at that wavelength. This is Kirchhoff’s Law, stated more directly as: A good absorber of radiation is also a good emitter of radiation at that same wavelength.

Detailed explanation-3: -Black is the best emitter because if something is black it means it’s strongly coupled to the electromagnetic field.

Detailed explanation-4: -Radiation is the transfer of heat energy through space by electromagnetic radiation.

Detailed explanation-5: -In simple terms what happens is that electromagnetic radiation has energy and when the radiation is absorbed by some atom, the kinetic energy of the atom increases. Heat can be loosely defined as the kinetic energy of atoms, and thus an increase in the kinetic enrgy leads to heating of the material.