20 Physics -- Rate of Heat Flow

a) What is meant by a perfect black body? How can you realize such a body in practice? b) Describe idea to estimate the temperature of sun.c) A spherical black body of radius 12cm radiates 450W power at 500K. If the radius were halved and the temperature doubled, what would be the power...

a) What is meant by a perfect black body? How can you realize such a body in practice? 

b) Describe idea to estimate the temperature of sun.

c) A spherical black body of radius 12cm radiates 450W power at 500K. If the radius were halved and the temperature doubled, what would be the power radiated? 

                                                                      Ans: 165.5 W

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