Thermodynamic and Statistical Physics (CSIR (Council of Scientific & Industrial Research) Physical Sciences): Questions 15  18 of 64
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Question number: 15
» Thermodynamic and Statistical Physics » Planck's Distribution Law
Appeared in Year: 2014
Question
A system can have three energy levels: . The level is doubly degenerate, while the others are nondegenerate. The average energy at inverse temperature is – (June)
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 16
» Thermodynamic and Statistical Physics » Free Energy
Appeared in Year: 2013
Question
Two different thermodynamic system are described by the following equations of state –
Where and are respectively the temperatures, the mole numbers and the internal energies of the two systems, and R is the gas constant. Let denote the total energy when these two systems are put in contact and attain thermal equilibrium. The ratio is – (December)
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Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 17
» Thermodynamic and Statistical Physics » Laws of Thermodynamics
Appeared in Year: 2014
Question
For a particular thermodynamic system the entropy S is related to the internal energy U and volume V by ; where c is a constant. The Gibbs potential for this system is – (June)
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Choice (4)  Response  

a. 


b. 


c.  Zero 

d. 


Question number: 18
» Thermodynamic and Statistical Physics » Planck's Distribution Law
Question
In low density oxygen gas at low temperature, only the translational and rotational modes of the molecules are excited. The specific heat per molecule of the gas is – (December)
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Choice (4)  Response  

a. 


b. 


c. 


d. 

