Engineering Physics - Dec 2014

First Year Engineering (P Cycle) (Semester 2)

TOTAL MARKS: 100
TOTAL TIME: 3 HOURS (1) Question 1 is compulsory.
(2) Attempt any four from the remaining questions.
(3) Assume data wherever required.
(4) Figures to the right indicate full marks. 1(a) Explain in brief Compton effect on the basis of quantum hypothesis. What is its physical significance?(6 marks) 1(b) Explain the terms Probability density, Normalization. Mention any two characteristics of wave function.(6 marks) 1(c) Obtain relationship between Group velocity and p hase velocity.(4 marks) 1(d) What is De Broglie wavelength of a proton whose energy is 3eV given mass of proton = $$ 1.67 \times 10^{-27} kg$$(4 marks) 10(a) Derive the Normal shock relationship using Rankine-Hugonit equation.(6 marks) 10(b) Discuss the ball Milling and Sol Gel Methods of Synthesis of Nano Materials. Mention advantages of each method.(10 marks) 10(c) What is a shock wave? Mention three applications.(4 marks) 2(a) Set up the one dimensional time independent schrodinger wave equation(7 marks) 2(b) State De Broglie hypothesis. Show that the De Brogl ie wavelength of an electron is found to be equal to $$\dfrac{12.26}{\sqrt{V}}A^{\circ}$$(6 marks) 2(c) State and explain Heisenberg's Uncertainty principle.(3 marks) 2(d) The position and momentum of 1keV electron are simultaneously determined. If its position is located within $$1A^{\circ}$$, find the uncertainty in the determination of its momentum.(4 marks) 3(a) Define the terms 1) Drift velocity 2) Mean free path 3) Relaxation time 4) Resistance(4 marks) 3(b) Discuss in brief the failures of CFET.(6 marks) 3(c) What are charge carriers in semiconductors. Stat e law of mass action. From this law obtain expression for Fermi level in an intrinsic semiconductor.(6 marks) 3(d) Write a note on high temperature superconductors.(4 marks) 4(a) What is hall effect? Obtain expression for Ha ll voltage in terms of Hall coefficient.(7 marks) 4(b) What are the types of super conductors. Explain.(6 marks) 4(c) The Hall coefficient of $$-3.68 \times 10^{-5}m^{3}/C $$ What is type of charge carriers? Also calculate the carrier concentration.(3 marks) 4(d) Explain in brief the construction and working of maglev.(4 marks) 5(a) Explain the construction and working of CO₂ laser.(7 marks) 5(b) Obtain expression for energy density in terms of Einstein's A & B co efficient.(3 marks) 5(c) Discuss point to point communication using an optical fiber with the help of block diagram.(5 marks) 5(d) Calculate numerical aperture, acceptance angle a nd critical angle of a fiber having a core RI 1.50 and cladding RI 1.45.(4 marks) 6(a) What is attenuation? Obtain expression for at tenuation co-efficient in an D37optical fiber of length L.(6 marks) 6(b) Explain the construction and reconstruction of H ologram.(6 marks) 6(c) Obtain expression for propagation of light throu gh an optical fiber.(5 marks) 6(d) Define the terms 1) Acceptance angle. 2) Populat ion inversion 3) Simulated emission.(3 marks) 7(a) Discuss the seven crystal systems in terms of Lattice parametric consideration and type of bravais lattice.(7 marks) 7(b) Calculate the atomic packing fraction of BCC and FCC.(6 marks) 7(c) Obtain Miller Indices of a crystal plane with in tercepts.
$$x=\dfrac{1}{3a},\ y=1b$$ and $$z=\dfrac{1}{2}c$$(3 marks) 7(d) Discuss the crystal structure of diamond.(4 marks) 8(a) Explain the Bragg's X ray diffractometer. How is crystal structure identified.(7 marks) 8(b) Explain in brief Principle and working of LCD, mention three uses.(8 marks) 8(c) Obtain expression for inter planar spacing in terms of Miller Indices.(5 marks) 9(a) What is Mach number. Distinguish between ultrasonic and acoustic waves.(4 marks) 9(b) Describe the operation and characteristic of Reddy Shock tube.(6 marks) 9(c) What is CNT? Mention two properties. How is it synthesized using pyrolysis method.(7 marks) 9(d) Mention the principle and 2 applications of SEM.(3 marks)