Thermodynamic and Statistical Physics (CSIR (Council of Scientific & Industrial Research) Physical Sciences): Questions 47  49 of 64
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Question number: 47
» Thermodynamic and Statistical Physics » Free Energy
Appeared in Year: 2011
Question
Assume that the free energy of a magnetic system has an expansion in the order parameter M of the form , with . As the temperature is lowered below , the system undergoes a phase transition. The behaviour of the order parameter just below the transition, where is very small, is best described by – (December)
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 48
» Thermodynamic and Statistical Physics » BoseEinstein Condensation
Appeared in Year: 2011
Question
Consider an ideal Bose gas in three dimensions with the energy – momentum relation with . The range of for which this system may undergo a Bose – Einstein condensation at a non zero temperature is – (June)
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 49
» Thermodynamic and Statistical Physics » Brownian Motion
Appeared in Year: 2011
Question
A gas of N non interacting particles is in thermal equilibrium at temperature T. Each particle can be in any of the possible non – degenerate state of energy . The average energy per particle of the gas, when , is – (December)
Choices
Choice (4)  Response  

a.  ε 

b. 


c. 


d. 

