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Classical Physics
Optics
Questions About Bragg's Law of X-Ray Diffraction
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[QUOTE="Drakkith, post: 6851655, member: 272035"] Of course not. The model you're working with is only concerned about the macroscopic behavior of an EM wave that encounters an obstacle. The details at the subatomic level aren't considered because it's taken as a starting condition that part of the EM wave is being blocked or absorbed at the slit boundaries somehow. Exactly how that works is left to another model. Why would it be? It turns out that the details simply don't matter for Young's experiment. You don't need to know how charges absorb and radiate EM radiation if you're doing a simple double-slit experiment. You only need to know that, however it works, the result is part of your wave being blocked, which then leads to the diffraction and interference effects seen in the experiment. I don't see any discrepancies in your posts. I see several models that describe different but related things. Huygens principle describes general wave propagation, Bragg's law gives you the angles of highest intensity for EM waves scattering from atomic planes in crystals, and Thompson scattering is concerned with how EM waves scatter off of free charged particles. You can, of course, derive all of these from more fundamental laws, and Huygens principle may in fact be useful in deriving the latter two (I'm not sure). [/QUOTE]
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Questions About Bragg's Law of X-Ray Diffraction
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