In a hexagonal close packed (hcp) structure of spheres, the fraction of the volume occupied by t...

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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) \( AB \)
(c) \( AB \)
(d) \( A \) is equal to the fraction in a simple cubic lattice.
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