Thermodynamic and Statistical Physics (CSIR Physical Sciences): Questions 44  46 of 56
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Question number: 44
» Thermodynamic and Statistical Physics » Free Energy
Appeared in Year: 2012
Question
The free energy difference between the superconducting and the normal states of a material is given by, where is an order parameter and and are constants such that in the normal and in the superconducting state, while always. The minimum value of is – (December)
Choices
Choice (4)  Response  

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Question number: 45
» Thermodynamic and Statistical Physics » Free Energy
Appeared in Year: 2011
Question
Gas molecules of mass ‘m’ are confined in a cylinder of radius R and height L (With R > > L) kept vertically in the Earth’s gravitational field. The average energy of the gas at low temperature (such that ) is given by, (December)
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Choice (4)  Response  

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Question number: 46
» Thermodynamic and Statistical Physics » Classical and Quantum Statistics
Appeared in Year: 2011
Question
Consider a system of N non – interacting spins, each of which has classical magnetic moment of magnitude . The Hamiltonian of this system in an external magnetic field is
where is the magnetic moment of the spin. The magnetization per spin at temperature T is: (June)
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Choice (4)  Response  

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b. 


c. 


d. 

