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The edge lengths of the unit cells in te...

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

A

`2sqrt(2r),(4r)/(sqrt(3)),2r`

B

`(4r)/(sqrt(3)),2sqrt(2r),2r`

C

`2r,2sqrt(2r),(4r)/(sqrt(3))`

D

`2r,(4r)/(sqrt(3)),2sqrt(2r)`

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The correct Answer is:
A
It is a fact (See packing efficienct. )
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