- #211
WernerQH
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Yes, photon is a theoretical concept. But in quantum field theory emission is just the time reverse of absorption. And the transfer of energy from an atom to the radiation field and vice versa is surely something physical.collinsmark said:Sure, it's easy enough to measure the reception of a photon (well, easier perhaps), but how do you measure/observe the emission of a photon without inferring it via mathematical artifacts?