CSIR (Council of Scientific & Industrial Research) Physical Sciences: Questions 378  381 of 463
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Question number: 378
» 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. 


Passage
In a system consisting of two spin particles labeled 1 and 2, let and denote the corresponding spin operators. Here, and are the three Pauli matrices. (June)
Question number: 379 (1 of 2 Based on Passage) Show Passage
» Quantum Mechanics » SpinStatistics Connection
Appeared in Year: 2011
Question
These two operators satisfy the relation,
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 380 (2 of 2 Based on Passage) Show Passage
» Quantum Mechanics » SpinStatistics Connection
Appeared in Year: 2011
Question
In the standard basis the matrices for the operators and respectively,
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Passage
The two dimensional lattice of graphene is an arrangement of Carbon atoms forming a honeycomb lattice of lattice spacing , as shown below. The Carbon atoms occupy the vertices. (June)
Question number: 381 (1 of 2 Based on Passage) Show Passage
» Condensed Matter Physics » Bravais Lattices
Appeared in Year: 2011
Question
The Bravais lattice for this array is a –
Choices
Choice (4)  Response  

a.  Rectangular lattice with basis vector and 

b.  Hexagonal lattice with basis vector and 

c.  Rectangular lattice with basis vector and 

d.  Hexagonal lattice with basis vector and 
