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B.Tech Semester Supplimentary Examinations, June 2009 APPLIED PHYSICS Bragg’s law, Schrodinger’s wave equation, Fermi energy, neat diagram i. absorption ii. spontaneous emission and iii. stimulated emission of radiation. BCC and FCC lattices, Schottky and Frenkel defects, Burgers vector, Hall effect, Laue’s method, Fermi-Dirac distribution, Davison and Germer experiment, Meissner effect, Miller indices, Ruby laser
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I B.Tech Semester Supplimentary Examinations, June 2009 APPLIED PHYSICS ( Common to Electrical & Electronic Engineering, Electronics & Communication Engineering, Computer Science & Engineering, Electronics & Instrumentation Engineering, Bio-Medical Engineering, Information Technology, Electronics & Control Engineering, Computer Science & Systems Engineering, Electronics & Telematics, Electronics & Computer Engineering and Instrumentation & Control Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆ ⋆ ⋆ ⋆ ⋆
(c) A magnetic material has a magnetization of 3300 ampere / m and flux density of 0.0044 wb / m^2. Calculate the magnetizing force and the relative perme- ability of the material. [4]
(b) Show that the superconductors are perfect diamagnetic materials. [6] (c) Write some of the applications of superconductors. [4]
i. absorption ii. spontaneous emission and iii. stimulated emission of radiation. [8] (b) What is population inversion? How it is achieved by optical pumping? [8]
(b) Write a note on diffusion length. [6] (c) The resistivity of an intrinsic semiconductor is 4.5 ohm-m at 20 oC and 2.0 ohm-m at 32 oC. What is the energy band gap? [4]
i. absorption ii. spontaneous emission and iii. stimulated emission of radiation. [8] (b) What is population inversion? How it is achieved by optical pumping? [8]
(b) Describe graded index optical fibre and explain the transmission of signal through it. [8] (c) What are different losses in optical fibres? Write brief note on each. [4]
I B.Tech Semester Supplimentary Examinations, June 2009 APPLIED PHYSICS ( Common to Electrical & Electronic Engineering, Electronics & Communication Engineering, Computer Science & Engineering, Electronics & Instrumentation Engineering, Bio-Medical Engineering, Information Technology, Electronics & Control Engineering, Computer Science & Systems Engineering, Electronics & Telematics, Electronics & Computer Engineering and Instrumentation & Control Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆ ⋆ ⋆ ⋆ ⋆
I B.Tech Semester Supplimentary Examinations, June 2009 APPLIED PHYSICS ( Common to Electrical & Electronic Engineering, Electronics & Communication Engineering, Computer Science & Engineering, Electronics & Instrumentation Engineering, Bio-Medical Engineering, Information Technology, Electronics & Control Engineering, Computer Science & Systems Engineering, Electronics & Telematics, Electronics & Computer Engineering and Instrumentation & Control Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆ ⋆ ⋆ ⋆ ⋆
ii. Magnetic Susceptibility.
(b) Describe the BCS theory of superconductivity. [6] (c) Write applications of superconductivity. [4]
(b) With the help of suitable diagrams, explain the principle, construction and working of a Ruby laser. [10]
i. step index and ii. graded index optical fibres. [6] (b) Discuss the various advantages of communication with optical fibres over the conventional coaxial cables. [6] (c) Calculate the refractive indices of core and cladding of an optical fibre with a numerical aperture of 0.33 and their fractional difference of refractive indices being 0.02. [4]