A parallel beam of X-rays is diffracted by a rock salt crystal. The first-order strong reflection is
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A parallel beam of X-rays is diffracted by a rock salt crystal. The first-order strong reflection is obtained when the glancing angle (the angle between the crystal face and the beam) is 6°50'. The distance between reflection planes in the crystal is 2.8 Å. What is the wavelength of the X-rays? (1 angstrom = 1 Å = 0.1 nm.)
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