Physics (Thermal physics) b.sc sem-3_2018, previous question papers download in telugu and English

Physics (Thermal physics) b.sc sem-3_2018, previous question papers download in Telugu and English

Subject :-(Physics)

Subject name :-(Thermal Physics)

Year :-(2018,2019)

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Physics- Thermal physics (semester-3)

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Important questions

1. Deduce an expression for the co-efficient of viscosity of a gas. 

2. What is entropy?

3. Explain its physical significance. One gram of water (volume 1 cm) becomes 1671 cm of steam when boiled at a pressure of one atmosphere. The latent heat of vaporization is 540 cal/gram. Compute the external work done and increase in internal energy, [1 atmosphere = 1.013 x 10 N/M²] 

4. Obtain Maxwell's equations in Thermodynamics. 

5. Explain the principle of adiabatic demagnetization. 

6. Calculate the molar heat capacity at constant volume of mercury at 0°C and one atmosphere. From expression we have C 28J mol deg, T= 273°C, V = 0.0147 Ltrs mol, a = 181 x 10 deg and compressibility = 3.94 x 10 atm. 

7. What is a black body? What are the salient features of black body radiation? 

8. Explain about Solar Constant. 

9. Calculate the average energy of an Oscillator of frequency 5.6 x 1012 Hz at T= 330K, it as 

(i) Classical Oscillator 

(ii) Plank's Oscillator. 

10. Define ensemble. Writes short note on Micro and Macro Canonical ensembles. 

11. Explain equipartition theorem. 

12. Calculate the probability that the speed of oxygen molecules lies between 100 and 101 meters/sec at 200K.

13. (a) Explain the concept of 'internal energy' of a system. Formulate the first law of thermodynamics and explain its physical significance. 

Or 

(b) Deduce an expression for the change of entropy when ice at 0°C is completely converted into steam. 

14. (a) State and explain Joule-Kelvin effect. Obtain an expression for Joule-Kelvin Co-efficient. 

Or 

(b) Obtain an expression for the difference of two molar specific heats. using Maxwell's relations. What do you infer from the expression regarding C and C 

15. (a) Obtain the Rayleigh Jeans formula for energy distribution in a black body radiation. 

Or 

(b) Deduce the number of modes of vibrations of standing waves formed by black body radiation in an enclosure in the frequency range "v and u+du". 

16. (a) Derive Maxwell-Boltzman velocity distribution law. Mention the cases where it fails and explain why. 

Or 

(b) What do you mean by the statistical equilibrium of an ensemble? Derive the necessary condition.

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