Particle Physics & Solid State Physics [Optionals IAS Mains Physics]: Questions 1 - 7 of 30

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Question 1

Particle Physics & Solid State Physics
Quark Structure of Hadrons

Appeared in Year: 2011 (IFS)

Describe in Detail

Essay▾

What are quarks? Give any four properties. Give quark composition of the following particles:

Explanation

  • Quark is one of the fundamental particles in physics. From the combination of these quarks, hadrons are formed, like proton and neutrons are formed by the quarks.
  • The anti – particle of a quark is the anti – quark. Quark and anti – quark are only two fundamental particles, which interact through all four fundamental forces of physics: Gravitational,…

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Question 2

Particle Physics & Solid State Physics
Band Theory of Solids-Conductors
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Appeared in Year: 2011 (IFS)

Describe in Detail

Essay▾

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.
Band Structures of Conductor, Semi – Conductor and Insulator
  • In insulators, the valence band is completely full with elec…

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Question 3

Particle Physics & Solid State Physics
Elementary Ideas About High Temperature Superconductivity

Appeared in Year: 2014

Write in Short

Short Answer▾

Lead in the superconducting state has critical temperature of at zero magnetic field and a critical magnetic field of Determine the critical filed at . (10 Marks)

Question 4

Particle Physics & Solid State Physics
Elements of Superconductivity
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Appeared in Year: 2003

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Essay▾

Explain why superconductors are perfect diamagnets? (20 Marks)

Explanation

  • Meissner and Ochsenfeld discovered that a superconductor expelled the magnetic flux as the former was cooled below in an external magnetic field i.e.. it behaved as a perfect diamagnet. This phenomenon is known as the Meissner effect. Such a flux exclusion is also observed if the superconductor is first cooled below and then placed in the magneti…

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Question 5

Particle Physics & Solid State Physics
Joseph-Son Junctions and Applications

Appeared in Year: 2003

Describe in Detail

Essay▾

What is a Josephson junction? Discuss Josephson Effect and obtain the relation

Or frequency (30 Marks)

Explanation

  • A Josephson junction is made by sandwilling a thin layer of a non-superconducting material between two layers of superconducting material. The devices are named after Brian Josephson, who predicted in 1962 that pairs of the superconducting electrons could “tunnel” right through the non-superconducting barrier from one superconductor to another. He …

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Question 6

Particle Physics & Solid State Physics
Classification of Elementary Particles and Their Interactions
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Appeared in Year: 2002

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Essay▾

Distinguish between Hadrons and leptons. (10 Marks)

Explanation

  • Elementary particles fall into two classes, leptons and hadrons, depending on whether they respond to the strong interaction (hadrons) or do not (leptons) .
  • The simplest particles are the leptons, which seen to be truly elementary with no hint of internal structures or ever of extension in space. Leptons are effected by the electromagnetic (if charg…

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Question 7

Particle Physics & Solid State Physics
Cubic Crystal Structure
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Appeared in Year: 2014

Describe in Detail

Essay▾

What is the reciprocal lattice & why is it named so? Derive the relationships for the primitive translation vectors of the reciprocal lattice in terms of those of the direct lattice. (20 Marks)

Explanation

  • The diffraction of X-rays occurs from various sets of parallel planes having different orientations (slopes) and interplanar spacing. In certain situations involving the presence of a number of sets of parallel planes with different orientations, it becomes difficult to visualize all such planes because of their two-dimensional nature. The problem …

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