Suppose that we have an atom $A$ in an excited state. This atom has a probability of emitting a photon $\gamma$. If we are in a finite space there is a probability that the atom $A$ absorbs the photon $\gamma$.
My question is when the atom emits the photon is the entropy ($S$) greater than zero? If so,when the atom absorbs the photon is the entropy ($S$) less than zero?

  • $\begingroup$ maybe you should read the definition of entropy en.wikipedia.org/wiki/Entropy and reform your question. A single atom cannot have entropy , can contribute to a statistical ensemble, but it is the ensemble that has entropy. $\endgroup$ – anna v Sep 12 at 15:05

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