Condensed Matter Physics (CSIR (Council of Scientific & Industrial Research) Physical Sciences): Questions 17  19 of 19
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Question number: 17
» Condensed Matter Physics » Reciprocal Lattice
Appeared in Year: 2016
Question
Consider a hexagonal lattice with basis vectors as shown in the figure below.
If the lattice spacing is , the reciprocal lattice vectors are: (December)
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 18
» Condensed Matter Physics » Diffraction and the Structure Factor
Appeared in Year: 2016
Question
Consider a one – dimensional chain of atoms with lattice constant . The energy of an electron with wave – vector is , where and are constants. If an electric field is applied in the positive direction, the time dependent velocity of an electron is:
(In the following is the constant) (December)
Choices
Choice (4)  Response  

a.  proportional of 

b.  proportional to 

c.  proportional to 

d.  independent of 

Question number: 19
» Condensed Matter Physics » Hall Effect and Thermoelectric Power
Appeared in Year: 2016
Question
A thin rectangular conducting plate of length and width is placed in the plane in two different orientations, as shown in the figures below. In both cases a magnetic field is applied in the direction due to the applied voltage .
If the Hall voltage across the direction in the two cases satisfy , the ratio must be: (December)
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 

