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VSD's work because a portion of the VSD molecule contains a chromophore, that is, a molecular structure that is responsible for absorbing light at one or more particular wavelengths. Absorption of light is entirely a function of the electronic structure of the chromophore. That is, light at a particular wavelength is absorbed by the molecule because the ...


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The only problem I have is that in most circuits there is more than one type of material, there are in fact many different materials that contribute to the overall current flow. It's not an ambiguity. Instead it's an unstated traditional over-simplification, as follows. A closed metal circuit may have many junctions between differing materials (e.g. ...



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