Thermodynamic and Statistical Physics (CSIR (Council of Scientific & Industrial Research) Physical Sciences): Questions 29  32 of 64
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Question number: 29
» Thermodynamic and Statistical Physics » Blackbody Radiation
Appeared in Year: 2011
Question
A cavity contains blackbody radiation in equilibrium at temperature T. The specific heat per unit volume of the photon gas in the cavity is of the form , where is a constant. The cavity is expanded to twice its original volume and then allowed to equilibrate at the same temperature T. The new internal energy per unit volume is – (June)
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 30
» Thermodynamic and Statistical Physics » Free Energy
Appeared in Year: 2013
Question
If the energy dispersion of a two – dimensional electron system is , where is the velocity and k is the momentum, then the density of states depends on the energy as, (June)
Choices
Choice (4)  Response  

a. 


b.  Constant 

c. 


d.  E 

Question number: 31
» Thermodynamic and Statistical Physics » Thermodynamic Potentials
Appeared in Year: 2014
Question
A Carnot cycle operates as a heat engine between two bodies of equal heat capacity until their temperature become equal. If the initial temperature of the bodies are and , respectively, and , then their common final temperature is – (Dec– 2013)
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 32
» Thermodynamic and Statistical Physics » Random Walk
Appeared in Year: 2014
Question
In one dimension, a random walker takes a step with equal probability to the left or right. What is the probability that the walker returns to the starting point after 4 steps? (June – 2014)
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 

