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An X$-$ray beam of $=85\mathrm{.}87pm$ is incident on the

surface of an atomic crystal. The maximum

reflection occurs at an angle of $38\mathrm{.}9.$

Part A

Calculate the separation between layers of atoms in the crystal $($assume $n=1).$

$108pm$

$46\mathrm{.}0pm$

$68\mathrm{.}4pm$

$137pm$

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