1.If 'aaa' 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 in these systems will be respectively,a.12a:32a:a2\frac{1}{2}a : \frac{\sqrt{3}}{2}a : \frac{a}{\sqrt{2}}21a:23a:2ab.a2:3a2:a2\frac{a}{2} : \frac{\sqrt{3}a}{2} : \frac{a}{2}2a:23a:2ac.a2:a2:a2\frac{a}{2} : \frac{a}{2} : \frac{a}{2}2a:2a:2ad.a2:3a4:a22\frac{a}{2} : \frac{\sqrt{3}a}{4} : \frac{a}{2\sqrt{2}}2a:43a:22aLogin to continueOnly logged in users canattempt or see the solution.