1.

If `a ` stands for the edge length of the cubic system `:` simple cubic, body `-` centred cubic anf face `-` centred cubic, then the ratio of radii of the spheres in these systems will be respectively`:`A. `(a)/(2):(asqrt(3))/(2):(asqrt(2))/(2)`B. `1a:sqrt(3)a:sqrt(2)a`C. `(a)/(2):(asqrt(3))/(4):(a)/(2sqrt(2))`D. `(a)/(2):sqrt(3)a:(a)/(sqrt(2))`

Answer» Correct Answer - c
For simple cubic,
`(r^(+))/(r^(-))=(a)/(2) (` where `a` is edge length `)`
For `b.c.c.,(r^(+))/(r^(-))=(asqrt(3))/(4)`
For `b.c.c.,(r^(+))/(r^(-))=(a)/(2sqrt(2))`


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