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If' ' \( a \) ' stands for the edge length of the cubic systems : simple cubic, body centred cubic and face centred cubic, then the ratio of radii of the spheres in these systems will be respectively,
(a) \( \frac{1}{2} a: \frac{\sqrt{3}}{4} a: \frac{1}{2 \sqrt{2}} a \)
(b) \( \frac{1}{2} a: \sqrt{3} a: \frac{1}{\sqrt{2}} a \)
(c) \( \frac{1}{2} a: \frac{\sqrt{3}}{2} a: \frac{\sqrt{3}}{2} a \)
(d) \( 1 a: \sqrt{3} a: \sqrt{2} a \)
\( \mathrm{P} \)
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