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In a hexagonal close packed (hcp) struct...

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

A

A=B

B

`AgtB`

C

`AltB`

D

A is equal to the fraction is a simple cubic lattice

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