JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech I ENGINEERING PHYSICS Previous Question Paper (September - 2023 - R13)
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
Deduce the spacing between (223) planes in a cubic crystal of lattice constant 0.15 nm.
Answer
For a cubic crystal, the interplanar spacing d is given by the formula:
Given a = 0.15 nm and (hkl) = (223), we have:
Find the packing factor of BCC lattice.
Answer
The atomic packing factor (APF) is the ratio of the volume of atoms in a unit cell to the total volume of the unit cell. For a BCC structure, there are 2 atoms per unit cell and the relation between lattice constant 'a' and atomic radius 'r' is 4r = a√3.
Calculate the wavelength of electron moving with velocity 5×106 m/s.
Answer
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Compare the properties of MB and FD statistics.
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Distinguish the Type I and Type II superconductors.
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The relative permittivity of Sulphur is 4. Calculate its atomic polarizability. Given that Sulphur is in cubic form and has density of 2.08×103 kg/m3 and atomic weight 32.
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Distinguish between the Interference and Diffraction phenomena of light.
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A thin sheet of glass (RI= 1.48) of thickness 5 micrometer introduce in a light path of an interferometer. It is causing shift of 10 fringes, find the wavelength of the light.
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Distinguish between drift and diffusion currents.
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In a solid, consider the energy level lying 0.02eV above Fermi Level. What is the probability of this level being occupied by an electron at 100K?
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Part B
Describe coordination number and packing factor for a FCC.
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Compare the Hydrogen bond and Vander-Waal’s bond with proper example.
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Briefly discuss the Laue method of X-ray diffraction.
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Analyze qualitatively different types of crystal defects.
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Discuss Davisson-Germer experiment to establish the concept of matter waves.
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Derive an expression for time independent Schrodinger’s equation.
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Describe qualitatively the Kronig-Penny model of solid.
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Illustrate the concept of canonical, micro canonical and grand canonical ensembles.
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What do you mean by internal field? Derive the expression for internal field for solids.
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Derive Clausius-Mososotti relationship for cubic solids.
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Discuss the domain theory of Ferro Magnetism on the basis of Hysteresis Curve.
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Explain the effect of magnetic field on superconductivity.
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Describe the interference in thin films and derive expressions and conditions of the interface patterns.
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Derive the quantitively diffraction phenomena due to single slit and related the maxima, minima conditions.
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Define Einstein’s coefficients of radiation and find the relation between them.
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Explain the application of optical fiber for communication system.
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Give a brief note on principle, construction and working of LED. What are its advantages and disadvantages?
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Derive an expression of Fermi level for in intrinsic and extrinsic semiconductor.
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State Sabine formula. Explain a method of calculating acoustics absorption coefficient of material.
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Write properties of nanomaterial. Discuss the fabrication of nanomaterials using Chemical Vapour Deposition (CVD) method.
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