JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech I Year APPLIED PHYSICS Previous Question Paper (September - 2023 - R22)
Part-A is a compulsory question. Part-B consists of ten questions (numbered from 2 to 11). From each unit, there are two questions and the student should answer one of them. Hence, the student should answer five questions from Part-B.
Part A
Answer all sub-questions:
What is the difference between classical and quantum mechanics?
Answer
Classical mechanics is deterministic and applies to macroscopic objects using Newton's laws, whereas quantum mechanics is probabilistic and applies to microscopic particles using wave functions and the Schrödinger equation.
If the momentum of a particle is increased to four times, then find the change in de-Broglie wavelength?
Answer
Since the de-Broglie wavelength is inversely proportional to momentum (λ = h/p), increasing the momentum to four times its original value results in the wavelength becoming one-fourth of the original value.
What will be the temperature co-efficient of an intrinsic semiconductor?
Answer
Sign in to view the complete answer paper.
How the bulk resistance of the semiconductor changes as the doping increases?
Answer
Sign in to view the complete answer paper.
Give two examples of paramagnetic material.
Answer
Sign in to view the complete answer paper.
What happens to a ferromagnetic material heated above curie temperature?
Answer
Sign in to view the complete answer paper.
What is Nanoscale?
Answer
Sign in to view the complete answer paper.
What is the procedure in the top-down synthesis of nanomaterials.
Answer
Sign in to view the complete answer paper.
Define numerical aperture.
Answer
Sign in to view the complete answer paper.
Can we obtain light amplification in the absence of stimulated emission?
Answer
Sign in to view the complete answer paper.
Part B
Derive the expression for time-independent Schrodinger wave equation.
Answer
Sign in to view the complete answer paper.
What are the assumptions in Drude-Lorentz theory?
Answer
Sign in to view the complete answer paper.
Explain Davisson-Germer experiment in detail? How does it explain the wave nature of electrons?
Answer
Sign in to view the complete answer paper.
Explain with suitable diagrams the conduction band, valence band and the forbidden band. Discuss the contribution of electrons and holes to electrical conduction?
Answer
Sign in to view the complete answer paper.
How n-type and p-type semiconductors are produced?
Answer
Sign in to view the complete answer paper.
Distinguish between Zener and avalanche breakdown?
Answer
Sign in to view the complete answer paper.
Define the following terms (i) Dielectric Polarization, (ii) Polarisability, (iii) Dielectric Constant, (iv) Spontaneous polarization, (v) Electric susceptibility.
Answer
Sign in to view the complete answer paper.
What is a bubble memory? What type of materials are used in it?
Answer
Sign in to view the complete answer paper.
Explain how the dielectric constant of a ferroelectric material varies with temperature. Name two ferroelectric materials?
Answer
Sign in to view the complete answer paper.
What are the applications of ferroelectric materials?
Answer
Sign in to view the complete answer paper.
List the similarities and differences between SEM and TEM.
Answer
Sign in to view the complete answer paper.
Explain Quantum confinement of nanoparticles.
Answer
Sign in to view the complete answer paper.
Explain in detail PVD and CVD methods of nano synthesis of films and relative merits.
Answer
Sign in to view the complete answer paper.
Write a note on surface to volume ratio.
Answer
Sign in to view the complete answer paper.
Differentiate between three level and four level lasers by giving suitable examples.
Answer
Sign in to view the complete answer paper.
Discuss merits and demerits of single mode optical fibers.
Answer
Sign in to view the complete answer paper.
Specify three types of possible energy transitions between two atomic energy levels and also derive conditions for Einstein’s coefficients.
Answer
Sign in to view the complete answer paper.
Light gathering capacity of an optical fibre is 0.479. If relative core cladding index difference is 0.005, calculate the refractive index of cladding if the outside medium is air.
Answer
Sign in to view the complete answer paper.