Jawaharlal Nehru Technological University Hyderabad
Jawaharlal Nehru Technological University Hyderabad B.Tech I Year ENGINEERING PHYSICS – II Previous Question Paper (May - 2019 - R16)
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.
PART A
Explain dual nature of light.
Answer
The dual nature of light refers to the phenomenon where light exhibits both wave-like properties (such as interference, diffraction, and polarization) and particle-like properties (such as the photoelectric effect and Compton scattering), depending on the experimental conditions.
Define de-Broglie’s hypothesis.
Answer
De-Broglie’s hypothesis states that all matter, including subatomic particles like electrons, possesses wave-like characteristics. The wavelength associated with a particle of momentum p is given by λ = h / p, where h is Planck's constant.
Define Fermi energy level at 0K.
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Draw V-I Characteristic curve of PN junction diode.
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Define Polarization vector.
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Explain pyro electricity.
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Define magnetic susceptibility.
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Distinguish between soft and hard magnetic materials.
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What is nano size? Explain briefly.
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Write any two applications of nanomaterials.
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PART B
With neat diagram explain Davisson and Germer’s experiment.
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Describe formation of energy bands in solids.
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Derive Schrödinger’s time independent wave equation.
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Explain physical significance of wave function (ψ).
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Distinguish between direct and indirect band gap semiconductors.
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Determine the concentration of the charge carriers in conduction band of intrinsic semiconductors.
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Explain formation of PN junction diode.
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Describe construction and working principle of Solar Cell.
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Derive an expression for Clausius-Mosotti relation.
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Describe Ferro electricity of a dielectric material.
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Derive an expression for electronic polarizability.
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Discuss Piezo electricity of a dielectric material.
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Discuss classification of magnetic materials.
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Explain hysteresis curve based on domain theory of ferro magnetism.
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What is Meissner’s effect? Write any two applications of superconductors.
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Derive an expression for Bohr magneton.
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Explain how surface to volume ratio varies in nano materials.
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Describe preparation of nanomaterials by using Sol-Gel method.
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Explain Quantum confinement.
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Explain how the nanomaterials are characterized by using SEM and TEM.
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