First slide

Crystal lattices and unit cells

Question

In Bragg’s X-ray diffraction studies, 100 pm X-ray has second-order diffraction at glancing angle of 30⁰. The interplanar spacing in the crystal in pm is

Moderate

Solution

$nλ = 2 d \sin θ$
$2 \times 100 = 2 \times d \times \frac{1}{2} \Rightarrow d = 200 pm$

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