Question: Consider two hypothetical metallic crystal structures A and B . A has an fcc and B a bcc lattice structure. Both have the same unit

Consider two hypothetical metallic crystal structures A and B. A has an fcc and B a bcc lattice structure. Both have the same unit cell volume.
The Atomic Packing Factor for A is 0.740 and that for B is 0.680. What is the ratio of the fcc to bcc atomic radii?

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