BT-201 (GS) – Engineering Physics

B.Tech. I & II Semester
Examination, June 2023
Grading System (GS)
Max Marks: 70 | Time: 3 Hours

Note:
i) Attempt any five questions.
ii) All questions carry equal marks.

Previous Year Questions (June 2023)

Q.1 a) State and prove (Elementary proof) Heisenberg's uncertainty principle.
b) Derive time dependent and time independent Schrodinger wave equation.

Answer of (a): To be posted here!


Answer of (b): To be posted here!

Q.2 a) Explain the working principle of Mach-Zehnder Interferometer with suitable ray diagram.
b) Explain Rayleigh's criterion of resolution. Derive an expression for resolving power of a grating.

Answer of (a): To be posted here!


Answer of (b): To be posted here!

Q.3 a) Draw and explain the V-I characteristic curve of P-N junction diode. Differentiate between Avalanche and Zener breakdown.
b) Explain Kronig Penney model for periodic potential. Write down the Schrodinger equation and discuss conclusion of this model.

Answer of (a): To be posted here!


Answer of (b): To be posted here!

Q.4 a) What is the working principle of an optical fibre? How light propagates through it? Define terms: Numerical aperture, Population inversion, V-number.
b) Explain construction and working of CO₂ laser with suitable energy level diagram.

Answer of (a): To be posted here!


Answer of (b): To be posted here!

Q.5 Write short note on any two:
a) Zener diode
b) Newton's ring
c) Intrinsic and Extrinsic semiconductor through Fermi level
d) Solar cell

Answer: To be posted here!

Q.6 a) State and prove equation of continuity. Explain its significance.
b) Define the electric field intensity. Find out the expression for electric intensity due to infinite line charge.

Answer of (a): To be posted here!


Answer of (b): To be posted here!

Q.7 a) Explain Hall effect. Derive expression for Hall coefficient and Hall angle.
b) Define wave function and state its properties. Derive energy and momentum operator.

Answer of (a): To be posted here!


Answer of (b): To be posted here!

Q.8 a) What is interference of light? Describe young's experiment and derive expression of fringe width.
b) Write down the difference between spontaneous and stimulated emission. Write down the applications of laser.

Answer of (a): To be posted here!


Answer of (b): To be posted here!