R20
QP code: R20A12BS03
Anurag University
I- B Tech II-Semester Supplementary Examinations, March-2022
Course: Applied Physics
(Common to EEE & ECE)
Time: 3 Hours Max Marks: 60
Section – A (Short Answer type questions)
Answer all questions: (10 x 2 =20Marks)
1. Why do sound waves diffract around buildings, although light waves do not?
2. Define Interference and explain constructive and destructive interference.
3. Outline the unique characteristics of Laser light?
4. Define optical fibre and what is its principle.
5. Calculate de-Broglie wavelength associated with a proton moving with a velocity
of th of velocity of light.
6. State Heisenberg’s Uncertainty principle and write any two applications.
7. What is effective mass of an electron and mention its expression.
8. With increase of temperature the conductivity of semiconductor increases while
that of metals decreases. Give reasons.
9. Distinguish between direct and indirect band gap semiconductors.
10. Write any four applications of LED.
Section—B (Essay Answer type questions)
Answer all questions: (5 x 8 =40 Marks)
11. A) With ray diagram discuss the theory of thin films and derive the conditions for
constructive and destructive interference in the case of reflected system.
OR
B) Discuss in detail Fraunhoffer diffraction due to single slit and hence obtain
intensity distribution curve.
12. A) Explain various types of optical fibers based on refractive index and
propagation in detail?
OR
B) Derive the Einstein co-efficients and give the relation between them.
13. A) Describe the experimental verification of matter waves using Davisson-Germer
experiment.
OR
B) Show that the energies of a particle in a potential box are quantized.
14. A) Using Kronig-Penney model show that the energy spectrum of an electron
contains a number of allowed energy bands separated by forbidden bands.
OR
B) Derive an expression for an intrinsic carrier concentration.
15. A) State and Explain Hall Effect? Obtain expression for Hall coefficient.
OR
B) Explain the construction and working of solar cell with neat diagram.
QP code: R20A12BS03
Anurag University
I- B Tech II-Semester Supplementary Examinations, March-2022
Course: Applied Physics
(Common to EEE & ECE)
Time: 3 Hours Max Marks: 60
Section – A (Short Answer type questions)
Answer all questions: (10 x 2 =20Marks)
1. Why do sound waves diffract around buildings, although light waves do not?
2. Define Interference and explain constructive and destructive interference.
3. Outline the unique characteristics of Laser light?
4. Define optical fibre and what is its principle.
5. Calculate de-Broglie wavelength associated with a proton moving with a velocity
of th of velocity of light.
6. State Heisenberg’s Uncertainty principle and write any two applications.
7. What is effective mass of an electron and mention its expression.
8. With increase of temperature the conductivity of semiconductor increases while
that of metals decreases. Give reasons.
9. Distinguish between direct and indirect band gap semiconductors.
10. Write any four applications of LED.
Section—B (Essay Answer type questions)
Answer all questions: (5 x 8 =40 Marks)
11. A) With ray diagram discuss the theory of thin films and derive the conditions for
constructive and destructive interference in the case of reflected system.
OR
B) Discuss in detail Fraunhoffer diffraction due to single slit and hence obtain
intensity distribution curve.
12. A) Explain various types of optical fibers based on refractive index and
propagation in detail?
OR
B) Derive the Einstein co-efficients and give the relation between them.
13. A) Describe the experimental verification of matter waves using Davisson-Germer
experiment.
OR
B) Show that the energies of a particle in a potential box are quantized.
14. A) Using Kronig-Penney model show that the energy spectrum of an electron
contains a number of allowed energy bands separated by forbidden bands.
OR
B) Derive an expression for an intrinsic carrier concentration.
15. A) State and Explain Hall Effect? Obtain expression for Hall coefficient.
OR
B) Explain the construction and working of solar cell with neat diagram.
