The Solid State

The Solid State

Question

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

  • 48% and 26%

  • 30% and 26%

  • 26% and 32%

  • 32% and 48%

Answer

C.

26% and 32%

Packing fraction of ccp is 74%
% free space in ccp = 26%
Packing fraction of bcc is 68%
%free space in bcc = 32%

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