GATE Physics: Questions 236  239 of 622
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Question number: 236
» Quantum Mechanics » Linear Vectors and Operators in Hilbert Space
Appeared in Year: 2013
Write in Short
A spin – half particle is in a linear superposition of its spin – up and spin – down states. If and are the eigenstate of then what is the expectation value, up to one decimal place, of the operator ? Here, symbols have their usual meaning.
Question number: 237
» Electronics » Semiconductor Devices
Appeared in Year: 2011
Question
For an intrinsic semiconductor, are respectively the effective masses of electrons and holes near the corresponding band edges. At a finite temperature, the position of the Fermi level –
Choices
Choice (4)  Response  

a.  Depends on both and 

b.  Depends on but not on 

c.  Depends neither on nor on 

d.  Depends on but not on 

Question number: 238
» Nuclear and Particle Physics » Liquid Drop Model » SemiEmpirical Mass Formula
Appeared in Year: 2011
Question
The semi – empirical mass formula for the binding energy of nucleus contains a surface correction term. This term depends on the mass number A of the nucleus as –
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 239
» Solid State Physics » Elements of Crystallography
Appeared in Year: 2013
Question
A lattice has the following primitive vectors : . The reciprocal lattice corresponding to the above lattice is –
Choices
Choice (4)  Response  

a.  BCC lattice with cube edge of 

b.  FCC lattice with cube edge of 

c.  BCC lattice with cube edge of 

d.  FCC lattice with cube edge of 
