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The edge lengths of the unit cells in the terms of the radius of spheres constituting fcc bcc and simple cubic unit cells are respectively…

a. 2√2r, 4r/√3, 2r

b.  4r√3,  2√2r, 2r

c.  2r, 2√2r, 4r/√3

d.  2r, 4r√3, 2/√2r

Ans. a

(6)

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