Question

In a hexagonal close packed (hcp) structure of spheres, the fraction of the volume occupied by the spheres is A. In a cubic close packed structure, the fraction is B. The relation between A and B is:

• A. $A=B$
• B. $A>B$
• C. $A<B$
• D. None of the above

Answer 1

The correct option is A $A=B$

In both hexagonal close-packed and cubic close-packed structures, the fraction of volume occupied by the spheres is 0.74.

Means A = B = 0.74

Hence, the correct option is A.