CONDENSED MATTER PHYSICS-III-2011

M.Sc. DEGREE EXAMINATION, APRIL/MAY 2011

Fourth Semester

Physics

Paper III – CONDENSED MATTER PHYSICS-III

Time: Three hours                                                                                               Maximum: 80 marks

Answer ALL questions.

All questions carry equal marks.

1.                 (a) Discuss different types of engineering materials based on their 

                   structure and bonding.

           (b) Discuss the properties of metal-polymer composites.

Or

            (c) Discuss the phase diagrams of a binary system of

                                    (i)  Complete solid solution.

                                    (ii)  Incomplete solid solution.

            (d) Discuss preparation and properties of metallic glasses.

2.                 (a) Explain what is transition. Briefly discuss the relevant theory.

            (b) Discuss the factors which affect glass transition temperature.

Or

            (c) Give example of glass forming systems and explain how the case of  

                   glass formation is determined.

            (d) Describe some interesting applications of glasses.

3.                 (a) When is a material called bio-compatible?

            (b) Discuss some important materials for bio-logical applications.

Or

            (c) Discuss the application of carbon and polymers as important materials.

            (d) Discuss what are soft tissue replacement implants and their advantages

                   and disadvantages.

4.                 (a) Discuss classification of liquid crystals based a molecular orientation.

            (b) Describe some applications of liquid crystals.

Or

            (c) Distinguish between quantum dots, quantum wines and quantum wells.

            (d) Discuss a few methods used for the preparation of nano-materials.

5.                 Write short notes on any TWO of the following:

a)    Different semi-conductor materials.

b)    Methods of preparation of glasses.

c)     Hydroxy apatite glass ceramics.

d)   Characterization methods for nano materials.

ELECTROMAGNETICS THEORY AND MODERN OPTICS - 2011

M.Sc. DEGREE EXAMINATION, APRIL/MAY 2011

Fourth Semester

Physics

Paper I – ELECTROMAGNETICS THEORY AND MODERN OPTICS

Time: Three hours                                                                                               Maximum: 80 marks

Answer ALL questions.

All questions carry equal marks.

1.                 (a) Write Maxwell’s equations and discuss their significance.

           (b) Discuss the propagation of electromagnetic waves in an isotropic  

                  dielectric  medium.

Or

            (c) Obtain relations for the reflection and refraction.

            (d) What are retarded potentials? Discuss their significance in  

                    electromagnetic wave  propagation.

2.                 (a) What are Einstein’s coefficients? Discuss the absorption and emission

                    processes  in a two level system.

(b) Discuss how population inversion can be obtained in a three level 

        system.

Or

(c) Obtain the threshold condition for laser production.

(d) Discuss line broadening mechanisms for a laser beam.

3.                 (a) Discuss how second harmonic generation can be obtained.

(b) Describe how optical mixing is achieved.

Or

(c) Give the basic theory of holography.

(d) Discuss how holograms are recorded and reconstructed.

4.                 (a) Describe different optical fiber modes and configurations.

(b) Discuss light wave propagation in a step indexed fiber.

Or

(c) Write about signal degradation in optical fiber communications.

(d) Describe how dispersion affects signal propagation through optical fiber.

5.                 Write short notes on any TWO of the following:

a)    Lienard-Wiechert potentials.

b)    Semiconductor GaAs laser.

c)     Self-focussing of light.

                              d) Graded index fiber.

ELECTROMAGNETIC THEORY AND MODERN OPTICS MODEL PAPER-1

Acharya Nagarjuna University

M.Sc Physics IV Semester

Model paper              

Paper I: ELECTROMAGNETIC THEORY AND MODERN OPTICS                                 

Time:  3 hrs                                                                                                            Max.Marks:80

        

 Answer all questions

                                  

1.   a)   State  the boundary  conditions  that are to be  satisfied by  the electric  and

             magnetic  fields  at  the surface of  separation of  two  dielectric media.

      b)   Deduce the expressions for the intensity   of the reflected and transmitted wave  

             is  incident  at  such an interface.

                                                                     OR

     c)    What is double refraction and discuss the propagation of light in double  

             refracting media.

2.  a)  Explain the working of ruby laser .

     b)  Discuss the line broadening mechanism.

                                                                    OR

     c)  What are the central features of semi conductor lasers?

     d)  Derive the expression for the laser action in semiconductor laser.

3.  a)  Give the basic principles of holography and explain its importance and uses.

                                                            OR

     b)   Write in detail about Fourier transform holography

4   a)   Discuss in detail the mode theory of circular wave guides.

     b)   Discuss various types of dispersions in optical fibers.

                                                              OR

     c)   Explain the structure and advantages of a step index optical fiber

     d)   Explain the signal degradation in optical fibers.

5      Write notes on any two of the following

   a)   Retarded Potentials

   b)   Population Inversion

   c)   Speckle pattern

   d)  Attenuation in optical fibers