Solid State PhysicsLattice Vibrations and Thermal Properties of Solid (GATE (Graduate Aptitude Test in Engineering) Physics): Questions 1  3 of 6
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Question number: 1
» Solid State Physics » Lattice Vibrations and Thermal Properties of Solid
Appeared in Year: 2015
Write in Short
The dispersion relation for phonons in a one dimensional monatomic Bravais lattice with lattice spacing and consisting of ions of masses M is given by,
Where is the frequency of oscillation, is the wavevector and C is the spring constant. For the long wavelength modes , the ratio of the phase velocity to the group velocity is ________.
Question number: 2
» Solid State Physics » Lattice Vibrations and Thermal Properties of Solid
Appeared in Year: 2013
Question
Group I contains elementary excitation in solids. Group II gives the associated fields with these excitations. MATCH the excitations with their associated field and select your answer as per codes given below.ListⅠ (Group I)  ListⅡ (Group II) 

(A) Polaron  (i) Elastic wave 
(B) Phonon  (ii) Electron + elastic deformation 
(C) Polariton  (iii) Photon + lattice vibration 
(D) Plasmon  (iv) Collective electron oscillations 
Choices
Choice (4)  Response  

 
a. 


b. 


c. 


d. 


Passage
The primitive translation vectors of the face centered cubic lattice are
Question number: 3 (1 of 2 Based on Passage) Show Passage
» Solid State Physics » Lattice Vibrations and Thermal Properties of Solid
Appeared in Year: 2009
Question
The primitive translation vectors of the reciprocal lattice are –
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 

