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The correct relationships between unit c...

The correct relationships between unit cell edge length ‘a’ and radius of sphere ‘r’ for face-centred and body-centred cubic structures respectively are:

A

2`sqrt2`r = a and `sqrt3`r = 4a

B

r=2`sqrt2`a and 4r = `sqrt3`a

C

r=2`sqrt2`a and `sqrt3`r=4a

D

2`sqrt2`r = a and 4r = `sqrt3`a

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