N A L A N D A O P E N U N I V E R S I T Y
M.Sc. Physics, Part-II
PAPER-XI
(Physics of Nan-Materials)
Annual Examination, 2016
Time 3 Hours. Full Marks 80
Answer any Five Questions.
All questions carry equal marks.
1. Derive an expression for the electrical conductivity of a free electron gas using the collision
time concept. Does this result explain the experimental value of resistivity of a metal
2. Discuss the motion of electrons in two dimensional potential well and obtain expression for
density of states.
3. What is a quantum wire Discuss the optical properties of quantum wires. Describe various
quantum wire devices.
4. What is difference between 'bottom and 'bottom down' methods of producing
nanoparticles Describe, in detail, the 'Sol-Gel method' of preparation of nanoparticles.
5. What is multiferroic magnetoelectric material Describe the applications of such materials.
6. What is Raman effect Discuss variations in Raman spectra of nanomaterials.
7. Describe the Hartree-Fock approximation of the Coulomb interaction between 3D confined
electrons. Mention the application of Hund's rule in quantum dots.
8. Name the six widely known methods to produce nanomaterials. Describe, briefly, at least
three of them.
9. Explain the phenomenon of photoluminescence, phosphorescence and chemiluminescence.
How do you account for the shift in the peaks of PL-spectra
10. Write notes on Plasma Arcing Biological nanomaterials.