JNTU
JNTU B.Tech I Year ENGINEERING PHYSICS Previous Question Paper (December - 2017 - R13)
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
What is unit cell?
Answer
A unit cell is the smallest repeating structural unit of a crystal lattice that, when translated repeatedly in three dimensions, generates the entire crystal structure. It is defined by three lattice vectors (a, b, c) and the angles between them (α, β, γ), which together determine the geometry and symmetry of the crystal system.
What are the Miller indices? How they are obtained?
Answer
Miller indices are a set of three integers (h, k, l) used to uniquely identify specific crystallographic planes within a crystal lattice. They represent the reciprocals of the fractional intercepts that a plane makes with the crystallographic axes.
The procedure to obtain Miller indices is as follows:
- Identify the intercepts of the plane along the x, y, and z axes in terms of the unit cell dimensions (a, b, c). If the plane is parallel to an axis, the intercept is considered infinity.
- Take the reciprocals of these intercepts.
- Reduce these reciprocals to the smallest set of whole numbers (integers) by multiplying by a common factor if necessary.
- Enclose the resulting integers in parentheses as (h k l).
Define de-Broglie’s hypothesis.
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What are the matter waves?
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Define Electric Susceptibility.
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Distinguish between Soft and Hard Magnetic Materials.
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Define interference.
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Explain Population Inversion.
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Define Time of Reverberation.
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What are the nanomaterials?
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Part B
Describe seven crystal structures with diagrams.
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Derive an expression for packing factor of BCC crystals.
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Write notes on point defects.
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Describe in detail the structure of Diamond.
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Calculate the ratio d100: d110: d111 for simple cubic structure.
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Write a note on Frenkel and Schottky Defects.
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Describe Davisson and Germer’s Experiment.
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Explain Maxwell-Boltzmann distribution law.
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Derive an expression for effective mass of an electron.
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Explain Heisenberg’s Uncertainty Principle.
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Describe Kronig-Penny Model.
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Write a note on Phase space and Ensembles
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Describe the phenomenon of electronic polarization and obtain an expression for electronic polarizability.
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Explain Domain Theory of Ferro Magnetism on the basis of Hysteresis Curve.
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Write a note on Meissner Effect.
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Derive an equation for Bohr Magneton.
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Explain Classification of Dia, Para and Ferro Magnetic Materials on the basis of Magnetic Moment.
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Distinguish between Type-I & Type-II Superconductors.
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Describe Newton rings experiment.
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Explain construction of Nicol prism.
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Derive an expression for acceptance angle and numerical aperture.
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What is Double refraction?
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Describe construction and working principle of Ruby laser system.
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Write the important applications of optical fibers.
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What is Hall effect?
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Describe construction and working principle of LED.
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Describe Sol-gel method for the preparation of nanomaterials.
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Discuss construction of Photo Diodes.
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Derive an expression for Sabine’s Formula for Reverberation Time.
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Explain the quantum confinement effects in nanomaterials.
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