# Absorption of radiation due to temperature

I was wondering if the temperature of an object affects the amount of radiation it absorbs.

For example, if I have a box that is hotter, will it absorb more energy as compared to the same cooler box?

-
I dount it will absorb more (except if it gets hotter it might expand and get a slightly larger surface to absorb radiation with). It will emit more radiation though, so the nett result will seem as if it absorbed less. Mind you, I am cutting corners here, and possibly quite a few more than I realize. –  Hennes Nov 21 '13 at 13:27

Real bodies absorb radiation of given wavelength with intensity proportional to their emissivity $\epsilon(\lambda, T)$, which in general depends on the temperature and possibly also on other state variables. Whether the absorption increases or decreases with temperature depends on the kind of body and range of temperatures, so it cannot be stated generally.