JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech I Year ENGINEERING PHYSICS - I Previous Question Paper (January/February - 2024 - R16)
Note: i) Question paper consists of Part A, Part B. ii) Part A is compulsory, which carries 25 marks. In Part A, Answer all questions. iii) In Part B, Answer any one question from each unit. Each question carries 10 marks and may have a, b as sub questions.
Part A
Two waves are in same phase, but differ in amplitudes, they are coherent explain?
Answer
Two waves are considered coherent if they maintain a constant phase difference over time. Since these waves are in the same phase, their phase difference is zero (a constant), which satisfies the condition for coherence regardless of differences in their amplitudes.
Write three uses of diffraction of light.
Answer
- Used in diffraction gratings for high-resolution spectroscopy to analyze light spectra.
- Used in the determination of crystal structures through X-ray diffraction.
- Used in optical communication systems for wavelength division multiplexing.
What is an optical wave plate and comment on their role in polarization?
Answer
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Define meta stable state and how these are obtained in the laser medium.
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Explain the principle of optical fiber.
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A fiber made with glass, the core and clad with refractive index 1.5 and 1.48, then find acceptance angle.
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Define space lattice and primitive cell.
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Draw the planes (110), (111) and (101) in a cubic unit cell with unit dimensions.
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Obtain condition for X-ray diffraction maxima.
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Define burgers vector and mention its significance.
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Part B
Describe the Newton rings experiment for the formation classical circular fringes.
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In Newton rings experiment, the diameter of the 4th and 12th dark rings are 0.4 cm and 0.7cm respectively, find the diameter of the 20th dark ring.
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Discuss the Faunhofer diffraction at single slit.
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How many orders will be visible if the wavelength of the incident radiation is 5000 A and the number of line on the grating is 2620 per inch.
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Explain the construction and working of Nicol prism.
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Define and explain the Malaus law.
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Describe the working of He-Ne laser with required energy levels diagram.
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Derive an expression for Einstein’s coefficients.
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Distinguish between Step index optical fiber and Graded index optical fiber.
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Explain the optical fiber communication system with schematic diagram.
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Define numerical aperture of an optical fiber and derive an expression for it.
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Explain the advantages of optical fibers.
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Describe the basic crystal systems with their Bravais lattices.
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Define Miller indices and mention its features.
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Calculate the atomic packing fraction for HCP unit cell.
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Show that SC unit cell is loosely packed than BCC.
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Discuss Schottkey and Frenkel defects in the crystals.
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Mention the advantages of defects in solids.
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Describe powder method for X-ray diffraction.
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Write note on stacking faults.
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