THERMAL PHYSICS

                       

Part C Questions

1. a).State zeroth law of thermodynamics

b). Explain the construction and working of platinum resistance thermometer

c).Explain the Callendar and Grifith bridge to measure the resistance and temperature

2. a).State the first law of thermodynamics

b). Derive an expression for internal energy (U) based on temperature and volume

c). Derive an expression for internal energy (U) based on temperature and pressure

3. a). Explain the working of an ideal carnot’s engine based on four stages

b). State second law of thermodynamics

4. a). Derive expressions for entropy of reversible and irreversible processes.

b). Derive expressions for entropy of isothermal change and adiabatic change.

c). Derive expressions for entropy of an ideal gas.

5. Derive the six Maxwell’s thermodynamics equations.

6. a). State Joule Thomson effect

b). Explain Porous plug experiment

c). Discuss the results obtained

7. Explain the experimental method of liquefaction of helium

8.. Explain the experimental method of liquefaction of air.

9. a). Explain adiabatic demagnetization by a suitable experiment.

b). State third law of thermodynamics.

10. a). Derive Maxwell distribution equation.

b). Hence deduce equations for average, mean square and most probable speeds.

11. a).Explain Lee’s disc method of determining the thermal conductivity of a bad conductor

12. a).Derive Plack’s law of radiation

b). Deduce Rayleigh Jean’s law and Wien’s law