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QUESTION 30
The lattice constant of the unit cell of a-iron (has a bcc structure) is 0.287 nm.
The number of atoms/mm2 (atoms per unit area) for the (111) plane is:
OA.9.86 X 10⁹ atoms/mm²
OB. 48.56 X 10° atoms/mm²
OC. 0.96 X 1013 atoms/mm²
OD. 22.11 X 10¹3 atoms/mm²

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