Physics of Materials — DU B.Sc. (Hons) Physics Previous Year Question Papers

: Physics of Materials (DSE Paper) : B.Sc. Hons.-Q'hysics)_NEP: UGCF-2022 (a) What is the difference between mobility and conductivity in semiconductors? How are they related mathematically? (b) (c) What are thermotropic liquid crystals? Explain their significance in display technology. Differentiate between single-walled and multi-walled carbon nanotubes (SWCNT and MWCNT) interns of structure and properties. \ (d) Write.the chemical structure and one key property each of polyethylene aE) and Epoxy resin. (e) Using a schematic diagram, explain the principle for the deposition of thin films using ® What is piezoelectricity? Explain one application of piezoelectric materials in sensors or actuators. Q2. (a) Der.ive expressions for electron and hole concentration in an n-type and p-type semiconductor using Fermi-Dirac statistics. (7 Marks) How do these parameters vary with temperature and doping? (8 Marks) Q3. a) Discuss the properties of ferroelectric, piezoelectric, and pyroelectric materials. Q4. (a) compare the chemical structure and properties of thermoplastic and thermosetting polymers with suitable examples. (7 Marks) (a) Discuss the anisotropic and birefringent properties of liquid crystals. Explain their applications in display technologies. (8 Marks) Q5. (a) Discuss the structure and properties ofFullerenes, single walled Carbon Nanotubes and Graphene. (6 Marks) a) Describe the synthesis of thin films using Thermal evaporation and MBE technique.