Solid State PhysicsMobility and Effective Mass (GATE (Graduate Aptitude Test in Engineering) Physics): Questions 1  4 of 4
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Question number: 1
» Solid State Physics » Mobility and Effective Mass
Appeared in Year: 2016
Write in Short
The energy vs wave vector relationship near the bottom of a band for a solid can be approximation as , where the lattice constant . The values of and are and , respectively. At the bottom of the conduction band, the ratio of the effective mass of the electron to the mass of fee electron is . (Give your answer up to two decimal placed)
(Take mass of free electron )
Passage
The tight binding energy dispersion relation for electrons in a one – dimensional array of atoms having lattice constant and total length is, ; where and are constants and is the wave – vector.
Question number: 2 (1 of 1 Based on Passage) Show Passage
» Solid State Physics » Mobility and Effective Mass
Appeared in Year: 2011
Question
The effective mass of electrons in the band is given by,
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Passage
The atomic density of a solid is . Its electrical resistivity is . Assume that electrical conduction is described by the Drude model (classical theory), and that each atom contributes one conduction electron.
Question number: 3 (1 of 2 Based on Passage) Show Passage
» Solid State Physics » Mobility and Effective Mass
Appeared in Year: 2007
Question
The drift mobility (in ) of the conduction electrons is –
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 4 (2 of 2 Based on Passage) Show Passage
» Solid State Physics » Mobility and Effective Mass
Appeared in Year: 2007
Question
The relaxation time (mean free time), in seconds, of the conduction electrons is –
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 

