Question

Packing efficiency of $hcp$ structure is

• A. $68\%$
• B. $52.4\%$
• C. $74\%$
• D. $82\%$

Answer 1

Answer: (C)

Maximum space occupied by hard spheres in hexagonal close packing
$=\frac{\pi \sqrt{2}}{6}=0.74$
$=74\%$