If $a$ stands for the edge length of the cubic systems, the ratio of radii in simple cubic, body-centered cubic, and face-centered cubic unit cells is:

Question

$\frac{1}{2}a : \frac{\sqrt{3}}{2}a : \frac{\sqrt{2}}{2}a$

$\frac{1}{2}a : \sqrt{3}a : \frac{1}{\sqrt{2}}a$

$a : \sqrt{3}a : \sqrt{2}a$

$\frac{1}{2}a : \frac{\sqrt{3}}{4}a : \frac{1}{2\sqrt{2}}a$

Solution

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