Thermodynamic and Statistical Physics (CSIR (Council of Scientific & Industrial Research) Physical Sciences): Questions 27  29 of 64
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Question number: 27
» Thermodynamic and Statistical Physics » Phase Space
Appeared in Year: 2011
Question
Consider the transition of liquid water to steam as water boils at a temperature of 100^{0} C under a pressure of 1 atmosphere. Which one of the following quantities does not change discontinuously at the transition?  (June)
Choices
Choice (4)  Response  

a.  The internal energy 

b.  The entropy 

c.  The specific volume 

d.  The Gibbs free energy 

Question number: 28
» Thermodynamic and Statistical Physics » Maxwell Relations
Appeared in Year: 2011
Question
A system of N non – interacting spin particles is placed in external magnetic field H. The behaviour of the entropy of the system as a function of energy is given by – (December)
Choices
Choice (4)  Response  

a. 
 
b. 
 
c. 
 
d. 

Question number: 29
» Thermodynamic and Statistical Physics » Blackbody Radiation
Appeared in Year: 2011
Question
A cavity contains blackbody radiation in equilibrium at temperature T. The specific heat per unit volume of the photon gas in the cavity is of the form , where is a constant. The cavity is expanded to twice its original volume and then allowed to equilibrate at the same temperature T. The new internal energy per unit volume is – (June)
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 

