QP code: R20A12BS03 R20
Anurag University
I- B Tech II-Semester Regular& Supplementary Examinations, Aug-2022
Course: Applied Physics
(EEE & ECE)
Time: 3 Hours Max Marks: 60
Section – A (Short Answer type questions)
Answer all questions: (10 x 2 = 20Marks)
1. Show that the area either between the successive bright newton rings or successive dark
newton rings is constant.
2. Find the number of orders if the wavelength of the light source is 6328 A° and if the
grating has 15000 lines per inch.
3. Calculate the fractional change in the refractive index for a given optical fibre if the
refractive indices of the core and cladding are 1.563 and 1.498 respectively.
4. Write any four applications of LASER in Science and Technology.
5. State Heisenberg’s uncertainty principle and write any two applications
6. Calculate the de-Broglie wavelength of an electron which has been accelerated from rest
by the application of potential 400V.
7. With increase of temperature the conductivity of semiconductor increases while that of
metals decreases. Give reasons.
8. Write the Fermi-Dirac function.
9. Write the examples of 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) Discuss the theory of Newton rings with relevant diagram and derive the expressions for
the wavelength of the sodium vapour light.
OR
B) Explain the construction and working of Nicol’s prism with neat diagram and mention any
four applications of it
12. A) Describe construction and working of Semiconductor (Homo junction and Hetero
junction diode) LASER with relevant diagrams.
OR
B) Explain various types of optical fibers based on refractive index profile and propagation in
detail.
13. A) Show that the energies of a particle in a potential box are quantized.
OR
B) Describe the experimental verification of matter waves using Davisson-Germer periment.
14. A) Using Kronig-Penney model show that the energy spectrum of an electron contains
number of allowed energy bands separated by forbidden bands.
OR
B) Derive an expression for density of electrons in intrinsic semiconductor
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.
Anurag University
I- B Tech II-Semester Regular& Supplementary Examinations, Aug-2022
Course: Applied Physics
(EEE & ECE)
Time: 3 Hours Max Marks: 60
Section – A (Short Answer type questions)
Answer all questions: (10 x 2 = 20Marks)
1. Show that the area either between the successive bright newton rings or successive dark
newton rings is constant.
2. Find the number of orders if the wavelength of the light source is 6328 A° and if the
grating has 15000 lines per inch.
3. Calculate the fractional change in the refractive index for a given optical fibre if the
refractive indices of the core and cladding are 1.563 and 1.498 respectively.
4. Write any four applications of LASER in Science and Technology.
5. State Heisenberg’s uncertainty principle and write any two applications
6. Calculate the de-Broglie wavelength of an electron which has been accelerated from rest
by the application of potential 400V.
7. With increase of temperature the conductivity of semiconductor increases while that of
metals decreases. Give reasons.
8. Write the Fermi-Dirac function.
9. Write the examples of 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) Discuss the theory of Newton rings with relevant diagram and derive the expressions for
the wavelength of the sodium vapour light.
OR
B) Explain the construction and working of Nicol’s prism with neat diagram and mention any
four applications of it
12. A) Describe construction and working of Semiconductor (Homo junction and Hetero
junction diode) LASER with relevant diagrams.
OR
B) Explain various types of optical fibers based on refractive index profile and propagation in
detail.
13. A) Show that the energies of a particle in a potential box are quantized.
OR
B) Describe the experimental verification of matter waves using Davisson-Germer periment.
14. A) Using Kronig-Penney model show that the energy spectrum of an electron contains
number of allowed energy bands separated by forbidden bands.
OR
B) Derive an expression for density of electrons in intrinsic semiconductor
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.
