1.

If 'a' stands for the edge length of the cubic systems: simple cubic, body centered cubic and face centred cubic, then the ratio of radii of the spheres in these systems will be respectively. 2.

Answer»

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

Answer :D


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