# B.Sc. (II YEAR) SEMESTER-IV PHYSICS MODEL QUESTION PAPER ADIKAVI NANNAYA UNIVERSITY

B.Sc. (II YEAR) PHYSICS

PHYSICS MODEL QUESTION PAPER

SEMESTER-IV (FOR MATHEMATICS COMBINATION)

PAPER IV: THERMODYNAMICS & RADIATION PHYSICS

Time:3 Hours                                                                                          Max.marks:75

SECTION-A

1. Explain the terms viscosity of gas and diffusion of gas.

2. State and prove Carnots theorem.

3. Deduce Clausius – Clapeyron equation. What is its importance.

4. Explain Joule Thomson effect.

5. Define solar constant. How do you estimate temperature of Sun.

6. Calculate the efficiency of reversible engine working between two temperature limits 72oC and 127oC .

7. The r.m.s speed of Hydrogen molecule is 1.34kmps. What will be the r.m.s speed of oxygen molecule at same temperature.

8. Determine the temperature of the sun with help of weins constant, given b = 2.92 X 10 -3m-k, maximum wavelength is 4900Ao.

SECTION – B

1.(a) Derive an expression for coefficient of thermal conductivity on the basis of kinetic theory of gases
Or
(b) Derive an expression for Maxwell’s law of distribution of molecular speeds of gas.

2. (a) Describe the working of Carnots engine and derive an expression for its effiency.
Or
(b) Describe Thermodynamic scale of temperature and explain its importance.

3. (a) Derive Maxwells thermodynamic relations by using Thermodynamic potentials.
Or
(b) Derive an expression for the ratio of specific heats of gas.

4. (a) Describe porous plug experiment of Joule Thomson.
Or
(b) Describe adiabatic demagnetization. Explain how low temperatures are obtained using this effect.

5. (a) Explain Quantum theory of radiation and derive Plank’s law.
Or
(b) Describe the construction and working of total radiation pyrometer.

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