Why visible light cannot be used as probe for determining crystal sttucture?
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Explanation:
➡️The atoms in a crystals are spaced at about 1 Angstrom apart.Visible light has a size (wavelength) of the order of 5000 Angstroms, so it cannot resolve the atoms in a crystal.
➡️X-rays have wavelength of the same order as that of interatomic separation in a crystal. That means Crystal structures are determined using X-rays as probes.
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Answer:
Crystals are defined as a period array of highly ordered atoms. Any perfectly crystalline object can exhibit this uniformity and if we were to somehow observe the inside of the crystal (far from the surfaces), then the periodic array of atoms should be uniform and invariant of what perspective you are looking at (isotropic).
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