Crystal Structures, Energy Bands, and Semiconductors Overview
Explore crystal structures, energy bands, and semiconductor materials in this quiz covering topics such as molecular vibrations, lattice types, and Fermi energy. Dive into fundamental concepts in materials science and physics.
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Presentation Transcript
Quiz_28 Previous material Crystal structures, energy bands New material Metals, Semiconductors, p-n junction Physics 274 11/9/2016
Q.1 Compare the energy difference between two adjacent molecular vibration levels with the energy difference between two adjacent molecular rotation levels. Which one is the largest ? A. Molecular vibrations B. Molecular rotations C. Coupled vibrations- rotations. D. Both have the same spacing in energy.
Q.2 This is the crystal structure of NaCl. What is the lattice type and how many atoms per lattice point? Hint: sc =simple cubic fcc= face centered cubic A. Lattice type =fcc; 1 atom per lattice point B. Lattice type =fcc; 2 atoms per lattice point C. Lattice type =sc; 1 atom per lattice point D. Lattice type =sc; 2 atoms per lattice poin
Q.3 This is a fcc lattice with two atoms per lattice point: one located at the corner and one located a way along the diagonal. What type of bond typically exists in this crystal structure? A. Ionic B. Covalent C. Metallic D. Van-der Waals
Q.4 At zero temperature, the Fermi energy (or Fermi level) is the A. Lowest energy of an electron B. Average energy of an electron C. Energy of the highest occupied state.
