CSIR (Council of Scientific & Industrial Research) Physical Sciences: Questions 320  322 of 463
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Question number: 320
» Atomic & Molecular Physics » Diatomic Molecules » Vibrational
Appeared in Year: 2012
Question
A system has two normal modes of vibration, with frequencies and . What is the probability that at temperature T, the system has an energy less than ?
[In the following and Z is the partition function of the system]
(June)
Choices
Choice (4)  Response  

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d. 


Question number: 321
» 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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b. 


c. 


d. 


Question number: 322
» Quantum Mechanics » Timeindependent Perturbation Theory and Applications
Appeared in Year: 2011
Question
A constant perturbation as shown in the figure below acts on a particle of mass confined in an infinite potential well between 0 and L.
The first – order correction to the ground state energy of the particle is –
Choices
Choice (4)  Response  

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b. 


c. 


d. 

