(a) If the radius of octahedral void is ...

(a) If the radius of octahedral void is 'r' and the radius of the atoms in close packing is 'R' what is the relation between 'r' and 'R' ?
(b) A metal crystallises in body centred cubic structure. If 'a' is the edge length of its unit cell, 'r' is the radius of the sphere, what is the relation between 'r' and 'a' ?

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(a) r = 0.414 R, (b) `r=(sqrt3)/(4)a`.

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