JNTU
JNTU B.Tech I Year ENGINEERING PHYSICS - I Previous Question Paper (December - 2018 - R16)
Note: This question paper contains two parts A and B. Part A is compulsory which carries 25 marks. Answer all questions in Part A. Part B consists of 5 Units. Answer any one full question from each unit. Each question carries 10 marks and may have a, b, c as sub questions.
Part A
Define interference.
Answer
Interference is the phenomenon of the redistribution of light energy in a medium due to the superposition of two or more coherent light waves, resulting in regions of maximum and minimum intensity.
What is diffraction
Answer
Diffraction is the phenomenon of bending of light waves around the sharp edges or corners of an obstacle or an aperture whose size is comparable to the wavelength of the light, resulting in the spreading of light into the region of geometrical shadow.
Explain the phenomenon of polarization of light.
Answer
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Explain spontaneous emission.
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Write any two applications of optical fiber.
Answer
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What is optical fiber? Explain basic principle of optical fiber
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Define Space lattice.
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Distinguish between unit cell and primitive cell.
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What are the conditions to occur diffraction due to X-rays?
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Define Burger’s vector.
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Part B
Discuss interference in thin film due to transmitted light.
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Write a note on Newton’s ring experiment.
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What is Coherence?
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Write a note on division of amplitude.
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Distinction between Fresnel and Fraunhofer diffraction.
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Discuss diffraction due to N- silts.
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Explain Malus law.
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What is double refraction?
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Explain the terms population and population inversion.
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Explain Quarter wave plate.
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With neat diagram explain working principle of Ruby laser system.
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Write any two applications of lasers.
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With neat diagram explain construction of optical fiber.
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Derive an expression for Acceptance angle.
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Derive an equation for Numerical aperture.
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Explain how Step index optical fibers are classified.
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Write a note on graded index optical fiber.
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What are the medical applications of optical fiber?
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With neat diagram explain types of crystal systems.
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Define crystal plane.
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Discuss construction of Diamond structure.
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What are the Bravais lattices?
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What are the Miller indices?
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Derive an expression for inter planner spacing of orthogonal crystal system.
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Derive an equation for Bragg’s law.
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Discuss powder method.
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Explain vacancy defect.
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Discuss Laue method.
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What is Frenkel defect?
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Write a note on Schottky defect.
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