Gleorgia Southerm University Allen E Paulson College of Engi

Gleorgia Southerm University Allen E. Paulson College of Engineering and Information Technology Mechanical Engineering ENGR 3331-Material Science Studio (Dec. 7, 2015) Exam Name: Lauaren Wolavr Eagle ID Bale Score: Part 1 (25 points) 1. Atomic mass unit is of the mass of carbon 12. 2. Atomic mass is total mass of average number of and in the number of atom in atomic mass unit. It is also the mass in gram of atoms 3. How much atoms are there in the unit cell of a. SC structure ( b. FCC structure 2 c. BCC structure atoms) atoms) atoms) 4. Instructions: Place the letter of the description (from the list on the right) Matching in the appropriate space (next to the term on the lefi) that best deseribes it. Dthe fraction of space in a unit cell occupied by atoms A. unit cell B. anisotropic C. basis E. grain boundaries -D, packing factor F. polymorphism G. repeat distance the fraction of space in a unit cell occupied by atomsA. unit cell having different properties in different directions regions between grains of a polycrystalline material the distance from one lattice point to another line materialP. pocking faetim along a direction H. rapid solidificatio , An atomic level bond based on electrical imbalance, which requires small amounts energy to disrupt. Common to soft materials like plastics. Materials usually have lo melting points. a. Vander Waals forces -b, covalent c.ionic metallic

Solution

1. 1/12th of the mass of C-12

2. Protons and neutrons, total

3. 1, 2 , 4

4. D B E G