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If 'a' stands for the edge length of the...

If 'a' stands for the edge length of the cubic systems : Simple cubic, body centred cubic and face centred cubic, then the ratio of the radii of the spheres, in these system will be respectively

A

`1//2a:(sqrt(3)a)/4:1/(2sqrt(2))a`

B

`1//2a:sqrt(3)a:1/(sqrt(2))a`

C

`1//2a:(sqrt(3))/2a:(sqrt(2))/2a`

D

`1a:sqrt(3)a:sqrt(2)a`

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