A photon of visible light with energy 2 eV is absorbed by a macroscopic body held at room temperature. By what factor does $\Omega$ for the macroscopic body change?
My instincts tell me that I should be using the relations $S=kln\Omega$ and $TdS-PdV=dU$, but how can I use these to my advantage? Thank you!
Edit: as I commented, my lack of understanding is with regard to how I can calculate the number of initial and final microstates, as well as the assumptions we can make.