Question

Why black-body preferred for thermal radiation study?

Answer 1

Answer:

That's because ozone absorbs most of the ultraviolet radiation. The ultraviolet radiation is the radiation whose wavelength is shorter than the wavelength of the visible light. That's why the ozone is important to protect us against the ultraviolet radiation.

Answer 2

All objects with a temperature above absolute zero (0 K, -273.15 oC) emit energy in the form of electromagnetic radiation. A blackbody is a theoretical or model body which absorbs all radiation falling on it, reflecting or transmitting none.