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प्रश्न
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?
पर्याय
74%
26%
50%
None of these
MCQ
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उत्तर
26%
Explanation:
AB AB AB... is hexagonal close packing (HCP), which (like cubic close packing) fills about 74% of the volume with spheres.
The empty (void) fraction
= 100% − 74%
= 26%
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