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The edge lengths of the unit cells in terms of the radius of supheres consituting fcc, bcc and simple cubic unit cell are respectively. ..
A. `2 , sqrt2r ,(4r)/sqrt3 , 2r`
B. `(4r)/sqrt3 , 2sqrt2, 2r`
C. `2r, 2sqrt(2r) , (4r)/sqrt3`
D. ` 2r, (4r)/sqrt3 , 2sqrt(2r)`

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Best answer
Correct Answer - A
For, fc `, r = a/(2sqrt2) or a = 2 sqrt2 r, " for bcc " , r =sqrt3/4 or a = 4r/sqrt3`
for simple , r = a/2 or a = 2r.

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