CSIR (Council of Scientific & Industrial Research) Physical Sciences: Questions 350  352 of 463
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Question number: 350
» Quantum Mechanics » Timeindependent Perturbation Theory and Applications
Appeared in Year: 2012
Question
Consider an electron in a box of length L with periodic boundary condition . If the electron is in the with energy , what is the correction to its energy, to second order of perturbation theory, when it is subjected to weak periodic potential , where is an integral multiple of the ? (June)
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 351
» 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. 


Question number: 352
» Thermodynamic and Statistical Physics » Maxwell Relations
Appeared in Year: 2012
Question
The energy required to create a lattice vacancy in a crystal is equal to . The ratio of the number densities of vacancies , when crystal is equilibrium at 1200 K and 300 K, respectively, is approximately, (June)
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 

