Thermodynamic and Statistical Physics (CSIR (Council of Scientific & Industrial Research) Physical Sciences): Questions 55  57 of 64
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Question number: 55
» Thermodynamic and Statistical Physics » Thermodynamic Potentials
Appeared in Year: 2011
Question
A heater and a thermocouple are used to measure and control temperature T of a sample at . A feedback circuit supplies power ‘P’ to the heater according to the equation with approximately tuned values of coefficients G and D. In order to maintain temperature stability in the presence of an external heat perturbation which causes small but rapid fluctuation of temperature, it is necessary to, (December)
Choices
Choice (4)  Response  

a.  Decrease G 

b.  Increase G 

c.  Increases D 

d.  Decrease D 

Question number: 56
» Thermodynamic and Statistical Physics » Classical and Quantum Statistics
Appeared in Year: 2012
Question
The dispersion relation of phonons in a solid is given by . The velocity of the phonons at large wavelength is, (June)
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 57
» Thermodynamic and Statistical Physics » Random Walk
Appeared in Year: 2016
Question
Consider a random walk on an infinite twodimensional triangular lattice, a part of which is shown in the figure below.
If the probabilities of moving to any of the nearest neighbor site are equal, what is the probability that the walker returns to the starting position at the end of exactly three steps? (December)
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 

