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				| 1. | Find the atomic density (atoms per unit area) for (110) plane of FCC lattice? (Given that the lattice parameter is a). | 
| A. | 2/ 2a<sup>2</sup> | 
| B. | 1/ 2a<sup>2</sup> | 
| C. | 2/ 3a<sup>2</sup> | 
| D. | 3/ 3a<sup>2</sup> | 
| Answer» B. 1/ 2a<sup>2</sup> | |