In the body eentered cubic unit cell and simple cubic unit cell, the radius of atom in terms of ...

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In the body eentered cubic unit cell and simple cubic unit cell, the radius of atom in terms of edge length \( (a) \) of the unit cell is respectively:
(a) \( \frac{a}{2}, \frac{a}{2 \sqrt{2}} \)
(b) \( \frac{a}{\sqrt{2}}, \frac{a}{2} \)
(c) \( \frac{a}{2 \sqrt{2}}, \frac{a}{2} \)
(d) \( \frac{\sqrt{3} a}{4}, \frac{a}{2} \)
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