Percentage of free space in cubic in a body- centred cubic unit cell is .

Options

A. 74
B. 68
C. 32
D. 26

Answer

C

Explanation

packing efficiency for bcc arrangement is 68 % which represents total filled space in the unit cell hence empty space in body centred arrangement is 10-68 = 32 %
note :- here ,empty space in bcc arrangement is asked therefore empty space in any crystal packing can be empty space in unit cell =100- packing efficiency