Thermodynamic and Statistical Physics (CSIR (Council of Scientific & Industrial Research) Physical Sciences): Questions 44  46 of 56
Get 1 year subscription: Access detailed explanations (illustrated with images and videos) to 401 questions. Access all new questions we will add tracking exampattern and syllabus changes. View Sample Explanation or View Features.
Rs. 300.00 or
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  

a. 


b. 


c. 


d. 


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)
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


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)
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 

