Question

Percentage of free space in cubic close packed structure and in body centred cubic structure are respectively:

• A. $48\%$ and $26\%$
• B. $30\%$ and $26\%$
• C. $26\%$ and $32\%$
• D. $32\%$ and $48\%$

Answer 1

The correct option is C $26\%$ and $32\%$

Packing fraction of face centered cubic cell is 74 % and body centered cubic cell is 68 %, So the percentage of free space will be 26% and 32% respectively.