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How are edge length 'a' of the unit cell and radius 'r' of the sphere related to each other in ccp structure? (Choose correct option for your answer)
A
a = 2r
B
a = r/$2\sqrt2$
C
a = 4r/$\sqrt3$
D
a = $2\sqrt2$ r
Detailed Solution
For ccp (fcc): $4r=\sqrt2\,a\Rightarrow a=\dfrac{4r}{\sqrt2}=2\sqrt2\,r$.