Particle Physics & Solid State Physics-Particle Physics [IAS (Admin.) Mains Physics]: Questions 1 - 7 of 10

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Question 1

Appeared in Year: 2011 (IFS)

Describe in Detail Subjective▾

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

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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,…

… (286 more words, 12 figures, 1 table) …

Question 2

Appeared in Year: 2002

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Distinguish between Hadrons and leptons. (10 Marks)

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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…

… (464 more words) …

Question 3

Appeared in Year: 2004

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A meson of rest mass comes to rest and disintegrates to a muon of rest mass and a neutrino of zero rest mass. Show that the kinetic energy of motion of the muon is

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Explanation

The decay equation is . Conserving energy gives

The meson (also called the pion) is a subatomic particle responsible for the strong nuclear force between protons and neutrons. It…

… (886 more equations, 7 figures) …

Question 4

Appeared in Year: 2004

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What is the difference between neutrino and antineutrino? How is helicity of neutrino determined?

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Explanation

The distinction between the neutrino and the antineutrino is a particularly interesting one. The spin of the neutrino is opposite in direction to the direction of its motion, the neutrino spins counterclockwise. The spin of the antineutrino, on the other hand, is in the same direction as its direction of motion, view…

… (329 more words) …

Question 5

Appeared in Year: 2017

Describe in Detail Subjective▾

Write down the quark constituents of each of the following: (Paper-2)

(1)

(2)

(3)

(4)

(5)

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Explanation

(1)

(2)

(3)

(4)

(5)

In particle physics,…

… (105 more equations) …

Question 6

Appeared in Year: 1995

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What are the term symbols of 2 equivalent electrons? Write down the term symbols in ascending order of energies (Marks 15)

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Explanation

Let us find the terms from Breit՚s scheme. In this scheme we write in a table all the possible values of which can be formed by the combination of of the two electrons. For this we write

… (598 more equations, 14 figures) …

Question 7

Appeared in Year: 2022

Write in Short Short Answer▾

Explain why each of the following particles cannot exist according to the quark model.

A Baryon of spin 1

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