IFS (Forests Services) Physics (Mains): Questions 28  34 of 34
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Question number: 28
» Molecular Physics » Elementary Theory of Rotational, Vibrational and Electronic Spectra of Diatomic Molecules
Appeared in Year: 2011
Describe in Detail
Give the elementary theory of NMR. Explain the two different relaxation processes. (Paper – II)
Explanation

In Nuclear Magnetic Resonance (NMR), the frequency of processing nucleus is equal to the frequency of rotating magnetic field. Here it is important to notice that in NMR we are not performing experiments on the electron, it all about the nuclei of the nucleus.

The principle of NMR is dependent on the spins of atomic nuclei. Consider, the su
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Question number: 29
» Quantum Mechanics I » Schroedinger Equation and Expectation Values
Appeared in Year: 2011
Describe in Detail
For a quantum mechanical system prove that all energy eigen – values are real and if , then the corresponding eigen functions are orthogonal.
Explanation

The eigenvalue equation, of the sets of energies and wave functions obtained by any quantum mechanics problems is given as,
For another value of the quantum number, we can write

Multiply equation (1) by and the c
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Question number: 30
» Particle Physics & Solid State Physics » Solid State Physics » Band Theory of SolidsConductors
Appeared in Year: 2011
Describe in Detail
How are the band structures of insulators and semiconductors similar? How are they different?
Explanation
 There is only one similarity in band structures of insulators and semiconductors. That is band gab between valence band and conduction band. And in case of conductor, there is no such band gap between valence and conduction bands.
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Question number: 31
» Electronics » Intrinsic and Extrinsic Semiconductors Pnp and Npn Transistors
Appeared in Year: 2011
Describe in Detail
What are intrinsic and extrinsic semi – conductors? Explain.
How are type and type semiconductors obtained?
Explanation
Intrinsic Semiconductors:

Intrinsic semiconductors are pure semiconducting material and no impurity atoms are added to them. The conductivity of the intrinsic semiconductor are at the room temperature is zero. It means the valence band of the intrinsic semiconductor is completely filled and conduction band is completely empty at room temperatu
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Question number: 32
» Nuclear Physics » Mass Parabolas
Appeared in Year: 2011
Write in Short
Find the density of nucleus. (Given, nuclear radius of carbon ) (Section  B)
Question number: 33
» Electronics » OpAmps, FET, JFET and MOSFET
Appeared in Year: 2011
Describe in Detail
Using OP – AMPs design an analog circuit to solve the following differential equation:
With,
Explanation
Here, the given second order differential equation is,
The analog circuit consist of op – amp for equation (1) is designed as,
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Question number: 34
» Thermal and Statistical Physics » Statistical Physics » BoseEinstein Condensation
Appeared in Year: 2011
Write in Short
Write down the expression for the Bose – Einstein distribution function and explain the meaning of the symbols used. (Section  B)