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If ‘a’ stands for length of the cubic system : simple cubic body centred cubic and face centred cubic then the ration of radii of the spheres in these systems will be respectively

a. 1/2 (a) : √3/2(a) : √2/2 (a)

b. 1 (a) : √3 (a) : √2(a)

c. 1/2 (a) : √3/4(a) : 1 / √2/2 (a)

d.1/2 (a) : √3/(a) : 1/ √2 (a)

Ans. c

 

(7)

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