According to Newton's law of cooling, the rate of cooling of a body is proportional to $(\Delta \theta {)}^n,$ where $\Delta \theta$ is the difference of the temperature of the body and the surroundings then $n$ is equal to -

Out of $10 \mathrm{J}$ of radiant energy incident on a surface, the energy absorbed by the surface is $2 \mathrm{J}$ and the energy reflected is $7 \mathrm{J}$. Then, coefficient of transmission of the body is

Given that $p \mathrm{joule}$ of heat is incident on a body and out of it $q \mathrm{joule}$ is reflected and transmitted by it. The absorption coefficient of the body is

Two thermometers $A$ and $B$ are exposed to sunlight. The valve of $A$ is painted black but $B$ is not painted. The correct statement regarding this case is