A metallic crystal crystallizes into a lattice containing a sequence of layers AB AB AB......Any packing of spheres leaves out voids in the lattice. What percentage of volume of this lattice is empty space?
A)74%
B) 26%
C)50%
D) none of these.
Correct Answer:
B
Solution :
[b] In AB AB packing spheres occupy 74%. 26% is empty.