$A$ body,which emits radiations of all possible wavelengths,is known as

$A$ body has a transmission power of $1/6$ and a reflection power of $1/3$. Find its absorption power.

Surface temperature of the sun is of the order of $K$.

$x$ joule of heat is incident on a body. Out of it, the total heat reflected and transmitted by it is $y$ joule. The absorption coefficient of the body is

Which of the following is the correct device for the detection of thermal radiation?

If $e_\lambda$ and $a_\lambda$ are the emissive power and absorptive power of a body respectively,and $E_\lambda$ is the emissive power of a perfectly black body,what is the relation according to Kirchhoff's law?