GATE (Graduate Aptitude Test in Engineering) Physics: Questions 18  22 of 622
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Question number: 18
» Quantum Mechanics » Angular Momentum and Spin
Appeared in Year: 2014
Write in Short
A hydrogen atom is in the state
Where in denote the principal, orbital and magnetic quantum numbers, respectively. If is the angular momentum operator, the average value of is________.
Question number: 19
» Solid State Physics » Elements of Crystallography
Appeared in Year: 2015
Write in Short
The lattice parameters of an orthorhombic crystal are related by . In units of , the interplanar separation between the planes is ________ (up to three decimal places)
Question number: 20
» Electronics » Semiconductor Devices
Appeared in Year: 2015
Write in Short
The bad gap of an intrinsic semiconductor is and . At 300 K, the Fermi level with respected to the edge of the valence band (in eV) is at ________ (up to three decimal places)
Question number: 21
» Classical Mechanics » Relativistic Kinematics
Appeared in Year: 2014
Write in Short
If the half – life of an elementary particle moving with speed in the laboratory frame is , then the proper half – life is ________.
Question number: 22
» Mathematical Physics » Elements of Complex Analysis » Residue Theorem and Applications
Appeared in Year: 2014
Question
The value of the integral Where C is the circle , is –
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 

