Particle Physics & Solid State Physics-Solid State Physics [Optionals IAS Mains Physics]: Questions 1 - 7 of 25

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Question 1

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

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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 2

Solid State Physics
Elementary Ideas About High Temperature Superconductivity

Appeared in Year: 2014

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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 3

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 4

Solid State Physics
Joseph-Son Junctions and Applications

Appeared in Year: 2003

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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 5

Solid State Physics
Cubic Crystal Structure
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Appeared in Year: 2014

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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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Question 6

Solid State Physics
Joseph-Son Junctions and Applications

Appeared in Year: 2010

Write in Short

Short Answer▾

What is Josephson tunnelling? Distinguish between Josephson effects. (10 marks)

Question 7

Solid State Physics
Meissner Effect

Appeared in Year: 1999

Describe in Detail

Essay▾

What is Meissner՚s effect? Superconducting tip has a critical temperature of in zero magnetic field and critical field at gauss. Determine the critical field at .

Explanation

  • Perfect diamagnetism effect: Meissner and Ochsenfeld discovered in 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 belo…

… (82 more words) …