CSIR (Council of Scientific & Industrial Research) Physical Sciences: Questions 290  293 of 463
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Question number: 290
» 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 

Question number: 291
» Electromagnetic Theory » Lorentz Invariance of Maxwell's Equation
Appeared in Year: 2012
Question
Which of the following quantities is Lorentz invariant? (June)
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 292
» Quantum Mechanics » Variational Method
Appeared in Year: 2012
Question
What would be the ground state energy of the Hamiltonian – If variational principle is used to estimate it with the trial wavefunction with b, as the variational parameter?
(December)
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 293
» Quantum Mechanics » Elementary Theory of Scattering » Born Approximation
Appeared in Year: 2012
Question
A free particle describe by a plane wave and moving in the positive z – direction undergoes scattering by a potential,
If is changed to , keeping R fixed, then the differential scattering cross section, in the Born approximation, (June)
Choices
Choice (4)  Response  

a.  Increases to twice the original value 

b.  Decreases to one fourth the original value 

c.  Increases to four times the original value 

d.  Decreases to half the original value 
