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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 radii of the spheres inthese systems will be respectively,

A

`1/2 a : sqrt3/4a : 1/(2sqrt2)a`

B

`1/2a:sqrt3a:1/sqrt2a`

C

`1/2a : sqrt3/2 : sqrt2/2 a`

D

`1a : sqrt3a : sqrt2a`

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A
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