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

  • Option 1)

    48% and 26%

  • Option 2)

    30% and 26%

  • Option 3)

    26% and 32%

  • Option 4)

    32% and 48%

 

Answers (1)

As we learnt in

Packing fraction for face centered cubic unit cell -

Pf = 0.74

-

 

 

Packing fraction for body centered cubic unit cell -

Pf = 0.68

-

 

(1)    Packing efficiency in CCP is 74% and empty space is 26%.

(2)    Packing efficiency in BCC is 68% and empty space is 32%.

Correct option is 3.

 

 


Option 1)

48% and 26%

This is an incorrect option.

Option 2)

30% and 26%

This is an incorrect option.

Option 3)

26% and 32%

This is the correct option.

Option 4)

32% and 48%

This is an incorrect option.

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