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LOYOLA COLLEGE (AUTONOMOUS), CHENNAI 600 034
B.Sc.DEGREE EXAMINATION -PHYSICS
THIRD SEMESTER APRIL 2018
PH 3503 PH 3505- THERMODYNAMICS
Date: 07-05-2018 Dept. No. Max. 100 Marks
Time: 01:00-04:00
PART-A
Answer ALL the questions: (10x2=20 Marks)
1. State the principle of equipartition of energy.
2. Find the rms velocity of the oxygen molecules at 27°C.
3. Define regenerative cooling.
4. What is super fluidity?
5. State first law of thermodynamics.
6. Define entropy.
7. What are Helmholtz and Gibbs functions? Relate them.
8. What is Joule -Kelvin effect?
9. Define phase space.
10. State Rayleigh Jeans law.
PART-B
Answer Any Four questions: (4x7.5=30Marks)
11. Define mean free path and derive an expression for it. (2.0 5.5)
12. Explain Andrew's experiment on liquefaction of CO2 with suitable diagram.
13. Show that entropy remains constant in a reversible process but increases in an
irreversible process. (3.5+4.0)
14. Explain Temperature -Entropy diagram for Carnot engine and also derive the
expression for its efficiency. (3.5+4.0)
15. Define microstate and macrostate.
Explain thermodynamic probability and relate it with entropy.
16. Derive Maxwell's velocity distribution law.
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PART-C
Answer Any Four questions: (4x12.5=50)
17. Deduce expressions for coefficient of viscosity of gases and coefficient of diffusion
on the basis of transport phenomenon. (5.0+7.5)
18. Explain Linde's process of liquefying air with suitable diagram.
Explain the properties of Helium II.
19. Deduce Clausious -ClaperonLatern heat equation.
Derive an expression for Clausious inequality.
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20. Derive Maxwell's thermodynamical equations.
21. Obtain the Bose-Einstein distribution function for an ideal Bose gas.
22. Derive Mayer's relation for a reversible adiabatic and isothermal processes.
Describe Clement and Desorme's method of determining Cp/Cv.