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The edge lengths of the unit cells in terms

Question:

The edge lengths of the unit cells in terms of the radius of spheres constituting

fcc,bcc and simple cubic unit cell are respectively________

(i) 2√2r, 4r/√3, 2r

(ii) 4r/√3, 2√2r, 2r

(iii) 2r, 2√2r, 4r/√3

(iv) 2r, 4r/√3, 2√2r

Solution:

Option (i) 2√2r, 4r/√3, 2r is the answer.

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