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Percent of vacant space in FCC unit cell is

  • Option 1)

    32

  • Option 2)

    26

  • Option 3)

    52

  • Option 4)

    74

 

Answers (1)

best_answer

Packing efficiancy in FCC unit cell

=\frac{4\times \frac{4}{3}\pi r^{3}}{\left ( 2\sqrt{2}r \right )^{3}}=0.74

% of packing efficiency =0.74\times 100=74%

Percent of vacant space =100-74=26%

 

Packing fraction for face centered cubic unit cell -

Pf = 0.74

-

 

 


Option 1)

32

This is incorrect

Option 2)

26

This is correct

Option 3)

52

This is incorrect

Option 4)

74

This is incorrect

Posted by

Aadil

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