LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034
B.Sc. DEGREE EXAMINATION – PHYSICS
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THIRD SEMESTER – November 2008
PH 3503 – THERMODYNAMICS
Date : 08-11-08 Dept. No. Max. : 100 Marks
Time : 9:00 – 12:00
SECTION-A
Answer ALL the questions (10×2=20)
- State the principle of equipartition of energy.
- Define Brownian Motion.
- Define the heat capacity of a substance.
- Given C V of an ideal gas is 2R, where R is the gas constant.
Determine the adiabatic exponent g = C P / CV.
- Define intensive variables and give examples.
- 6 J of heat is supplied to a system and the internal energy of the
system decreases by 3 J. Find the work done.
- Write down the Gibbs – Helmholtz equation.
- Define phase transition. Give an example.
- Define thermodynamic probability.
- State Wein’s displacement law.
SECTION-B
Answer Any Four questions. (4×7.5=30)
11) (a) Define mean free path. [2]
(b) Obtain an expression for the mean free path. State your
assumptions clearly. [5.5]
12) Explain the process of liquefying hydrogen.
13) From the first law of thermodynamics, obtain the relation:
P P
14) Obtain the Maxwell’s thermodynamic relations.
15) (a) Define microstates and macrostates. [3]
(b) How will you distribute 3 particles among 4 states under
Maxwell-Boltzmann and Bose-Einstein statistics? [4.5]
SECTION-C
Answer Any Four questions (4×12.5=50)
16) Discuss Langevin’s theory of Brownian motion.
17) (a) Discuss Clement-Desormes method to determine the ratio of
specific heats. [8]
(b) Describe the properties of He I and He II [4.5]
18) (a) Obtain the Clausius inequality. [8.5]
(b) Calculate the entropy change when 5 Kg of water is heated from
to . Assume that the specific heat capacity has a
Constant value of 4200 J/Kg-K. [4]
19) Explain Joule-Kelvin effect. Obtain an expression for the Joule-Kelvin
coefficient. Discuss the significance of the various terms in it.
20) Obtain the Bose-Einstein distribution for an ideal Bose gas. State the
various assumptions made.
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