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Dec 28, 2014 at 13:39 vote accept M.A.R.
Dec 28, 2014 at 7:26 comment added DavePhD The energy of excitation comes from electromagnetic radiation (light). It could be visible, infrared, ultraviolet, or microwave depending upon the transition.
Dec 25, 2014 at 19:39 comment added M.A.R. can you please give more description of your answer? I repeat the question: Where does the energy of excitation come from? Or is this just my misunderstanding?
Dec 20, 2014 at 21:39 history answered DavePhD CC BY-SA 3.0