Infrared radiation is detected by

The absorption coefficient value of a perfect black body is

Out of the following, which statement is $NOT$ true about black body radiation?

Which of the following statements is wrong?

Inside a closed furnace held at a temperature of $400\, K,$ we have a black body. $A$ hole of area $10\, cm^2$ is opened in the furnace so that sunlight starts falling on the black body. The intensity of sunlight is $2000\, W/m^2.$ In the steady state:

As compared to a person with white skin,a person with black skin will experience: