A beam of x rays of wavelength 29.3 pm is incident on a calcite crystal of lattice spacing 0.313 nm. We have to find the smallest angle between the crystal planes and the beam that will result in constructive reflection of the x rays.
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Solution: Click For PDF Version The Bragg’ law for crystal diffraction is
where d is the lattice spacing. It is given that
and
Therefore, the smallest angle between the crystal planes and the beam that will result in constructive interference will be
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