Quiz Material Science PDF

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Quiz Material Science for this semester...

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1. Between two types of crystal structure, it tells which can contain more atomic spheres in each of their unit cell. Answer: Atomic Packing Factor Reference: Chapter 3.4 Metallic Crystal Structures, the meaning of Atomic Packing Factor the fraction of solid sphere volume in the unit cell.

2. In cubic crystals, planes and directions having the same indices are parallel to one another. True or False? Answer: True Reference: Planes and directions having the same indices are parallel to one another since in Miller indices they are all equally spaced in all set of parallel planes.

3. The bar over the appropriate index indicates ____________. Answer: Negative Indices Reference: Chapter 3.6 Metallic Crystal Structures, the meaning of Negative Indices are represented by a bar over the appropriate index.

4. A. In a Hexagonal Closed Packed Structure, each particle remains in contact with 6 particles. B.) In Body Centered Cubic, 32% of the entire cube is unused space. Both A and B are False Both A and B are True Only A is True Only B is True Answer: Only B is True Reference: Basis in proving that there is 12 not 6 atoms in a HCP: https://youtu.be/4cRRA8IzU_w Steps how to calculate the 32% unused space: https://youtu.be/HCWwRh5CXYU

5. A BCC unit cell is located at x, y, z axis. One of its corner atoms (atom 6) is located at point (0,0,1), two others are at point (1,0,0) and point (0,1,0). What is the k index number of the plane that intersects atom 6 location point, point (0, 2/3, 0) and point (3, 0, 0)? Answer: The k index is 9

6. A set of whole numbers to represent a plane or a direction inside a single crystal. Answer: Miller Indices Reference: Miller Indices is a group of three numbers that indicates the orientation of a plane or set of parallel planes of atoms in a crystal....