Distribution of energy in the spectrum of a black body can be correctly represented by

For a perfectly black body,its absorptive power is

According to Kirchhoff's law,the ratio of emissive power to absorptive power for all bodies is:

If there were no atmosphere on Earth,its temperature would be ...... .

We consider the radiation emitted by the human body. Which of the following statements is true?

Heat energy is incident on the surface of a material at the rate of $1000 \ J \ min^{-1}$. If the coefficient of absorption is $0.8$ and the coefficient of reflection is $0.1$,then the amount of heat energy transmitted through the material in $5$ minutes is: (in $J$)