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,

Options

A. `(1)/(2)a,sqrt3a:(1)/(sqrt2)a`
B. `(1)/(2)a,sqrt3a:(sqrt2)/(2)a`
C. `1a:sqrt3a:sqrt2a`
D. `(1)/(2)a:(sqrt3a)/(4):(1)/(2sqrt2)a`

Explanation

(d) Ratio of radius of scc, bcc fcc will be `(a)/(2):(sqrt3)/(4)a:(1)/(2sqrt2)a`