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Sub : Engg Physics

Chapter -I: Modern physics

1. Explain dual nature of matter .
2. Discuss de -Broglie hypothesis and obtain an expresssion for de - Broglie wavelength .
3. Explain briefly Davisson and Germer's experiment with the set up and the experimental confirmation of the same .
4. List out the characteristics of matter waves.
5. Define Phase velocity and group velocity , Derive a relation between the two.
6. Deduce an expression for de - Brogile wavelength in terms of group velocity .
7. Establish the relation ship between group velocity and phase velocity.
8. State Heisenberg's uncertainity principle and explain its physical significance .
9. Derive time independent Schrodinger's wave equation and explain Eigen functions and Eigen values .
10. Obtain the time independent Schrodinger's wave equation for a particle in one dimensional potential well of infinite height , discuss the solution & case of free particles. .

Chapter-II: Electrical conductivity in metals.

1. Explain classical free electron theory or Drude - Lorentz free in theory of metals .
2. State the main assumptions of classical free electron theory .
3. Define mean free path , Mean collision time, drift velocity and relaxation time.
4. Obtain an expression for electrical conductivity with the help of classical free electron theory .
5. Obtain an Expression for current flowing through a metal with the help of classical free electron theory.
6. Explain the effects of temperature and impurity on electrical resistivity of metals .
7. List out the assumptions of Quantum free electron theory of metals .
8. Compare and contrast classical and Quantum free electron theory.
9. Define Fermi -energy , Fermi factor and discuss Fermi -Dirac distribution .
10. Obtain an expression for density of states.

Chapter-III: dielectric properties of materials.

1. What are the dielectrics? Discuss the effect of electric field on dielectric materials.
2. Define electric polarization mechanism.
3. List out the different polarization mechanism and explain each of them.
4. Define internal field of dielectric and hence derive the expression for the same for 1 dimension atomic array.
5. What is lorentz field ?Obtain the expression for the same.
6. Define the dielectric susceptibility? Obtain the relation between P ,?,E.
7. Explain the theory how static dielectric constant of a dielectric materials is determined.
8. Explain the temperature dependence of static dielectric constant.
9. Explain the frequency dependence of polarislibility.
10. Explain the changes observed in a dielectric material with increase in temperature in terms of polarization .
11. Define Relaxation time and Relaxation frequency for a dielectric material .
12. Write a note on dielectric loss (A.C).
13. Derive an expression for tangent loss or dielectric loss.
14. What are ferrites.
15. Discuss the properties and applications of ferrites.
16. Describe the feature of ferrite structures.
17. What are hard magnetic materials? List out their properties and application
18. Compare soft and hard magnetic materials on the basis of hystersis curves.
19. State any two properties and applications each for hard and soft magnetic ferrites

Chapter-IV: Superconductivity

Explain Meissenu effect.

• Mention and explain the classification of super conductors (soft & hard).
• Why are typeI and typeII super conductors called soft and hard super conductors.
• Describe briefly the formation of copper pairs. [formation]
• Describe how BCS theory explains super conductivity.
• Explain the magnetic behaviour of type-I & type-II super conductors.
• Write a note on high temperature super conductivity.
• Write a brief note on Maglev vechicles.
• What are super conducting magnets ? Explain their construction and working
• What are SQUIDs? List out their applications.

Chapter-V: Applied Optics

1. Explain the basic principles of spontaneous and stimulated emission.
2. Describe the 3 possible ways through which radiation and matter interaction takes place.
3. Explain the terms population inversion, metastable state, pumping action and stimulated emission.
4. Obtain an expression for energy density at thermal equilibrium.
5. What are the requists of a laser system.
6. Discuss the conditions for laser laser action.
7. Explain the construction and working of a ruby laser with energy level diagram.
8. Give any 4 applications of ruby laser.
9. What is lasing action? Describe the working of helium neon laser with the help of energy level diagram . Mention the industrial applications of He-Ne laser.
10. Explain the construction and operation of a helium neon laser with a neat diagram.
11. How stimulated emission takes place with the exchange of energy between helium and neon atoms.
12. Describe the applications of laser welding ,cutting and drilling. Give their advantages on conventional methods.
13. Describe the way the images are recorded and constructed in holography.
14. Describe how laser is employed in measurement of pollutants in atmosphere.
15. Write a note on holographic technique.
16. Mention the applications of holography.
17. Describe the principle on which optical fiber works.
18. Explain the proporgation mechanism in optical fibers.
19. Define a) Critical angle of propogation b) half angle of acceptance c) numerical aperture.
20. Obtain the condition for propogation in optical fibers.
21. Discuss the types of optic fibers and the modes of propogation.
22. Describe the different types of optical fibers along with the typical code and
23. cladding diameters , refractive index profile and mode propogation sketches.
24. What are the advantages of optical communications over the conventional type of Communication.
25. List out the applications of optical fibers?
26. Explain point to point communication in optical fibers.

Chapter -VI: Crystal structure

1. Discuss the advantages and disadvantages of optical communication system by listing them.
2. Define space lattice, unit cell and bravais lattice.
3. What is a space lattice? Describe briefly the 7 systems of crystal.
4. What are primitive and non primitive cells .
5. What are lattice parameters.
6. Distinguish bravais lattice and non- bravais lattice.
7. What are direction and planes in a crystal ? Mark the direction and plane of your choice for a cubic unit cell.
8. What are miller indices and explain the procedure for obtaining the same.
9. What are coordination number and atomic packing factor. List out the same for simple cubic, bcc and fcc ?
10. Describe the crystal structures of Nacl ,diamond?
11. Explain the origin of continious and characteristic X-rays?
12. Derive Bragg's law for X-ray diffraction .
13. Describe how Bragg's diffractometer is used to determine the wavelength of an X-ray beam.