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

B

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

C

`2r:(4r)/(sqrt(3)):(4r)/(sqrt(2))`

D

`2r:(4r)/(sqrt(2)):(4r)/(sqrt(3))`

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The correct Answer is:

C

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