Applied Physics Question Bank
Unit - 1
1. Derive an expression for the time independent Schrödinger’s wave equation.
2. What are matter waves? Mention properties of matter waves.
3. What is the wave function? List out significance of wave function
4. Describe Davisson & Germer’s experiment with neat diagrams and explain how it enables us to verify
the wave nature of matter
5. Deduce the normalized wave function for a particle which is confined to a one-dimensional potential
well
6. Define and Derive expression for effective mass of electron.
7. Explain the classification of solids based on the band theory of solids.
8. What is Photoelectric effect?
9. State Heisenberg’s uncertainty principle.
10. What is de-Broglie’s hypothesis?
Unit – 2
1. Deduce the expression for the concentration of holes in the valence band of an intrinsic semiconductor
at a temperature ‘T.’
2. Give a brief note on the construction and working principle of LED with a relevant energy band diagram.
3. With neat diagrams, explain the construction and working of a solar cell and explain the V-I
characteristics of a solar cell.
4. Write brief note on PIN diode.
5. Explain the formation of a P-N junction depletion region and discuss V-I characteristics under various
biasing conditions.
6. What is Hall Effect? Derive an expression for experimental determination of Hall coefficient.
7. Distinguish between Intrinsic and Extrinsic semiconductors
8. What is N – type and P- type semiconductors?
9. What are direct & indirect band gap semiconductors?
10. List out applications of Hall effect.
UNIT -3
1. Write a brief note on Ferro electricity and Piezoelectricity.
2. Explain various types of polarization mechanisms in dielectrics.
3. What is the Meissner Effect? Explain how Meissner proved mathematically that a superconductor
behaves as a perfect diamagnetic material.
4. Distinguish between Type I & Type II superconductors
5. Explain B-H magnetic Hysteresis curve based on Domain theory.
6. Differentiate hard and soft magnetic materials based on hysteresis loss and the area of the B-H loop?
7. List out few applications of superconductors."
8. What are Superconductors? Give examples.
9. What is flux quantization?
10. Define electric polarization, electric susceptibility and dielectric constant.
UNIT -4
1. With a neat diagram, discuss how to scan and characterize the nanomaterials using a beam of electrons
(SEM).
2. Summarize Sol- Gel technique to fabricate the nanomaterials
3. Summarize the bottom-up approach CVD to fabricate the nanomaterials
4. Illustrate XRD characterisation technique that is employed to analyze the nanomaterials.
5. Explain applications of Nanomaterials.
6. Define Nanoscience and Nanotechnology.
7. What is quantum confinement and increase in surface area to volume ratio ?
UNIT -5
1. Using a relevant energy band diagram, describe the construction and working of a 765us
semiconductor diode to emit laser.
2. Using a relevant energy level diagram, describe the construction and working of He-Ne gas laser.
3. Using a relevant energy level diagram, describe the construction and working of a Ruby laser.
4. Define stimulated absorption and distinguish between spontaneous and stimulated emissions.
5. Evaluate an expression for the light-gathering ability (NA) and acceptance launching angle in the core
of an optical fiber.
6. Based on the refractive index profile, classify types of optical fibers.
7. Draw and explain the structure and major components of optical fiber. And explain the working
principle of optical fiber with a neat sketch.
8. List out various applications and advantages of optical fibers.
9. What are the characteristics of Laser? And List out few applications of Laser.
10. What is pumping, population inversion and meta stable state?
