Question

Black bodies are:
(A) good absorbers and bad radiators
(B) good absorbers and good
radiators
(C) bad absorbers and good radiators
(D) bad absorbers and bad radiators
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Answer 1

Answer: b) Good Absorbers and Good Radiators.

Explanation: A  perfect black body absorves all radiations of all wavelength completely. According to Kirchhoff's Law , Good absorbers are also a good radiators. So, A perfect black body also emmits all radiation of all wavelength at high temperature. Hence, A perfect black body is Good Absorber as well as  Good Radiator. Sun is also a perfect black body as it emmits all type of radiation of all wavelengths.

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.