LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034
B.Sc. DEGREE EXAMINATION – PHYSICS
THIRD SEMESTER – APRIL 2012
PH 3505/PH 3503 – THERMODYNAMICS
Date : 26-04-2012 Dept. No. Max. : 100 Marks
Time : 9:00 – 12:00
PART – A
Answer ALL the questions: (10×2=20)
- Define Brownian Motion.
- Give the unit of thermal conductivity.
- Write down the equations of state for an ideal gas when it undergoes a
reversible isothermal and adiabatic changes.
- Define super fluidity.
- Given of an ideal gas is 2R, where R is the gas constant, determine the adiabatic
- State the 2nd law of thermodynamics.
- Write down the Gibbs – Helmholtz equation.
- Define phase transition. Give an example.
- Define microstates and macrostates.
- Classify the following particles according to the statistics they obey:
- i) electrons ii) photons iii) protons and iv) helium-4.
PART – B
Answer Any FOUR questions: (4×7.5=30)
- Obtain an expression for the coefficient of thermal conductivity of a gas, on the basis of
kinetic theory of gases.
- Describe Linde’s process for the liquefaction of air.
- a) Write the first law of thermodynamics. What does it signify? (2+5.5)
- b) One mole of oxygen, initially at 17°C, is adiabatically compressed so that its pressure
becomes 10 times the initial value. Find its final temperature and the work done.
- Obtain the Maxwell’s thermodynamic relations.
- a) Define thermodynamic probability. (2+5.5)
- b) Obtain an expression for the solar constant in terms of the Sun’s
temperature, its radius, the mean Sun-Earth distance etc.
PART – C
Answer Any FOUR questions: (4×12.5=50)
- Discuss Langevin’s theory of Brownian motion.
- a) Discuss Clement-Desormes method to determine the ratio of specific heats.
- b) Describe the properties of He I and He II. (8+4.5)
- a) Define reversible and irreversible processes.
- b) Obtain the Clausius inequality. (4+8.5)
- Explain Joule-Kelvin effect. Obtain an expression for the Joule-Kelvin coefficient.
Discuss the significance of the various terms in it.
- Obtain the Maxwell-Boltzmann distribution for an ideal gas.
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