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

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

A

`1/2 alpha : sqrt3/2 alpha : sqrt2/2 alpha`

B

`1 alpha : sqrt3 alpha : sqrt2 alpha`

C

`1/2 alpha : sqrt3/4 alpha : 1/sqrt2 alpha`

D

`1/2 alpha : sqrt3alpha : 1/sqrt2 alpha`

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The correct Answer is:

C

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