JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech I Year ENGINEERING PHYSICS – II Previous Question Paper (March/April - 2023 - R16)
Part A is compulsory (25 Marks). Answer all questions. In Part B, Answer any one question from each unit (50 Marks). Each question carries 10 marks.
PART A
State and explain Heisenberg uncertainty principle.
Answer
The Heisenberg uncertainty principle states that it is fundamentally impossible to simultaneously measure both the exact position (x) and the exact momentum (p) of a quantum particle with absolute precision. The product of the uncertainties in these measurements is always greater than or equal to a constant value.
Mathematically, Δx represents the uncertainty in position and Δp represents the uncertainty in momentum, where ℏ (h-bar) is the reduced Planck's constant (h / 2π). This principle implies that the more precisely the position of a particle is determined, the less precisely its momentum can be known, and vice versa, reflecting the wave-particle duality inherent in quantum mechanics.
What is the importance of Davisson and Germer experiment?
Answer
The Davisson and Germer experiment is of fundamental importance in quantum mechanics because it provided the first direct experimental evidence for the wave nature of matter, as proposed by the de Broglie hypothesis. By demonstrating that electrons undergo diffraction when scattered from a crystalline nickel surface, the experiment confirmed that particles exhibit wave-like properties with a wavelength defined by the relation
What is the Fermi level?
Answer
Sign in to view the complete answer paper.
Explain the working principle of a Solar cell.
Answer
Sign in to view the complete answer paper.
Define electric dipole, polarizability.
Answer
Sign in to view the complete answer paper.
Define piezoelectricity and pyroelectricity.
Answer
Sign in to view the complete answer paper.
Explain the Permeability in magnetism.
Answer
Sign in to view the complete answer paper.
Mention three applications of superconductivity.
Answer
Sign in to view the complete answer paper.
Mention two biomedical application of nanotechnology.
Answer
Sign in to view the complete answer paper.
Explain quantum confinement phenomenon?
Answer
Sign in to view the complete answer paper.
PART B
What are the matter waves? Derive an expression for the de-Broglie wavelength of an electron.
Answer
Sign in to view the complete answer paper.
Explain energy band formation in solids.
Answer
Sign in to view the complete answer paper.
Explain the behavior of an electron moving in a field of periodic potential using kronig and Penny model.
Answer
Sign in to view the complete answer paper.
Explain in detail E-K curve.
Answer
Sign in to view the complete answer paper.
Calculate the carrier concentration in P-type semiconductor.
Answer
Sign in to view the complete answer paper.
Explain direct and indirect band gap semiconductors.
Answer
Sign in to view the complete answer paper.
Explain the formation of PN junction diode and V-I characteristics of the same.
Answer
Sign in to view the complete answer paper.
Derive an expression for density of electrons in intrinsic semiconductors.
Answer
Sign in to view the complete answer paper.
Derive an expression for ionic polarizability.
Answer
Sign in to view the complete answer paper.
Derive Clausius - Mossotti relation.
Answer
Sign in to view the complete answer paper.
What is meant by local field in dielectrics and how it is calculated for cubic structure?
Answer
Sign in to view the complete answer paper.
What is meant by Ferro electricity? List out the applications of ferro-electrics.
Answer
Sign in to view the complete answer paper.
Explain in detail ‘Meissner effect’ and magnetic levitation.
Answer
Sign in to view the complete answer paper.
Write notes on Type-I, and Type-II super conductors.
Answer
Sign in to view the complete answer paper.
Discuss the properties and effect of external field on the para and ferro magnetic materials.
Answer
Sign in to view the complete answer paper.
What is meant by Hysteresis loss? Describe the formation of hysteresis loop using domain wall movement.
Answer
Sign in to view the complete answer paper.
Explain in detail Sol–gel preparation method. Discuss the applications of Nanotechnology.
Answer
Sign in to view the complete answer paper.
How do you determine the size of the particle using XRD characterization technique?
Answer
Sign in to view the complete answer paper.
How do you synthesize the nonmaterial using Chemical Vapor Deposition (CVD) method?
Answer
Sign in to view the complete answer paper.
Write short note on Ball milling method.
Answer
Sign in to view the complete answer paper.