Thermodynamic and Statistical Physics (CSIR Physical Sciences): Questions 38  40 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: 38
» Thermodynamic and Statistical Physics » Ferromagnetism
Appeared in Year: 2012
Question
The magnetization M of a ferromagnet, as a function of the temperature T and the magnetic field H, is described by the equation . In these units, the zero – field magnetic susceptibility in terms of is given by, (June)
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 39
» Thermodynamic and Statistical Physics » Ising Model
Appeared in Year: 2012
Question
Consider a one – dimensional Ising model with N spins, at very low temperature when almost all the spins are aligned parallel to each other. There will be a few spin flips with each flip costing an energy . In a configuration with spin flips, the energy of the system is and the number of configuration is ; varies from 0 to N. The partition function is – (December)
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 40
» Thermodynamic and Statistical Physics » Blackbody Radiation
Appeared in Year: 2012
Question
Consider black body radiation contained in a cavity whose walls are at temperature T. The radiation is in equilibrium with the walls of the cavity. If the temperature of the walls is increased to 2T and the radiation is allowed to come to equilibrium at the new temperature, the entropy of the radiation increases by a factor of (June)
Choices
Choice (4)  Response  

a.  8 

b.  16 

c.  4 

d.  2 
