Jawaharlal Nehru Technological University Hyderabad 2003 B.Tech Production Engineering I Supplementary s, ember- ENGINEERING PHYSICS - exam paper

Code No.NR-10153
I B.Tech. Supplementary Examinations, November-2003

ENGINEERING PHYSICS
(Common to Civil Engineering, Mechanical Engineering, Aeronautical Engineering, Chemical Engineering, Production Engineering, Mechatronics Metallurgy and Material Technology)
Time: three hours Max.Marks: 80
ans any 5 ques.
All ques. carry equal marks
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1.a) Derive the formula of motion for a damped harmonic oscillator under the action of an external periodic force and hence find expression for amplitude of vibration.
b) What are harmonics? discuss.

2.a) Describe and discuss ‘diffraction of light’ by a plane grating.
b) How many lines per centimetre should be there on grating, for resolution of 2 lines of wavelength 589 nm and 589.6 nm?
c) Describe the phenomenon of interference of polarized light.

3.a) Obtain the formula for the equilibrium condition of absorption and emission of radiation by atoms, and hence discuss the term ‘Einstein’s coefficients’.
b) Describe, with suitable diagrams and equations, how a ray of light is propagated in an optical fiber.

4.a) Explain the terms used in crystallography:
(i) Primitive cell (ii) Lattice parameters and (iii) Packing factor.
b) Derive an expression for the interplanar spacing in the case of a cubic structure.
c) Calculate the glancing angle of (110) plane of cubic crystal having axial length 0.26 nm corresponding to the 2nd order diffraction maximum for the X-rays of wavelength 0.065 nm.

5.a) What is meant by superconductivity?
b) What are Type-I and Type-II superconductors?
c) Explain BCS theory of superconductivity.

6.a) State the difference ranging from dia-magnetism, para-magnetism and
ferro-magnetism.
b) Explain the action of a magnetic field on an electronic orbit and hence derive an expression for the susceptibility of a dia-magnetic specimen
7.a) Discuss with suitable mathematical expressions, the motion of an electron in a periodic potential.
b) Explain how the above theory leads to the concepts of band structure of solids and Brillouin Zones.

8. Write short notes on any 3 of the following:
(a) Colours of thin films
(b) Point defects in crystals
(c) Piezoelectric materials
(d) Thermoelectric effects
(e) Electric polarization.

Earning:   Approval pending.