# AKNU Third Semester Physics important Questions

AKNU Third Semester Physics important Questions

Unit-1

1. What is the maxwell’s law of distribution of molecular speeds in a gas? Describe the experiment to prove it.
(Tooth wheel experiment).
2. Define coefficient of viscosity on the basis of kinetic theory gases. Derive an expression for the coefficient of
viscosity.
3. Define coefficient of thermal conductivity on the basis of kinetic theory gases. Derive an expression for the
coefficient of thermal conductivity.
4. Define coefficient of diffusion on the basis of kinetic theory gases. Derive an expression for the coefficient of
diffusion.
Unit-2
5. Describe the caront’s engine and its working. Derive an expression for its efficiency.
6. State and prove Carnot’s theorem.
7. What is T-S Diagram. Derive an expression of efficiency of a Caront’s engine using T-S diagram.
Write the uses of T-S diagram.
8. Describe the change in entropy in reversible and irreversible process.
Unit-3
9. Define four thermodynamic potentials and use them to derive maxwell’s thermodynamic equations.
10. Explain the Joule -Kelvin effect. Derive expression for Joule – Kelvin effect for an Ideal gas. .
11. Define molar specific heats.
Derive an expression for the difference of two specific heats (𝐶p− 𝐶v = 𝑅)
Derive an expression for the ratio of two specific heats (𝐶p/𝐶v = y)
Unit-4
12. Explain the Joule Kelvin or Joule Thomoson effect. Describe porus plug experiment and write its results (OR)
Derive an expression for Joule-Thomson cooling.
13. Explain necessary theory the adiabatic demagnetization method for producing very low temperature.
Unit-5
14. Derive Plank’s formula for distribution of energy and deduce Raleigh – Jeans law as a special case of Plank’s law.
15. Define solar constant. Explain how it is determined experimentally (OR) Explain Angstrom’s pyroheliometer.
5 Marks
Unit-1
16. Explain and derive the free mean path equation of a gas.
17. Explain various types of Transport phenomena
18. Derive the equation for Relation between coefficient of viscosity & coefficient of thermal conductivity.
19. Derive the equation for Relation between coefficient of viscosity & coefficient of diffusion
Unit-2
20. Derive work done by an ideal gas in isothermal and adiabatic process.
21. Explain reversible and irreversible process.
22. State and explain the second law of thermodynamics (Kelvin & clausius).
23. Derive an expression for the change in entropy when a substance undergoes change of state (ice changes to into
steam).
24. Explain about entropy and its physical interpretation.
25. Distinguish between isothermal and adiabatic process.
26. Problems
Unit-3
27. Derive Classius – Clayperon equation and write its applications.
28. Explain the Joule -Kelvin effect.
29. Problem
Unit-4
30. Give the applications or properties of low temperature. (M-6Q-71P)
31. Distinguish between adiabatic expansion and Joule –Thomson expansion. (M-4Q-71P)
32. Problems (72 page- 1,3 Questions)
Unit-5
33. Explain energy distribution in a black body radiation and its characteristics.
34. How do you estimate the temperature of the sun? .
35. Explain about black body and ferry’s black body.
36. Define Kirchoff’s law, Stefan’s law, Wien’s displacement law and Rayleigh Jeans law.
37. Problems
Updated: April 16, 2022 — 2:36 pm
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