Fundamentals of Physics Chapter 44 Solutions: Quarks, Leptons, and the Big Bang

Resnick Halliday and Walker Fundamentals of Physics Volume 2 Solutions for Chapter 44 ‘Quarks, Leptons, and the Big Bang’ is a meticulously crafted guide for those willing to pass influential competitive exams such as JEE and NEET. In this chapter, we find two lines of inquiry that are genuinely “new” but at the same time have the most ancient origins. They are based on two deceptively easy questions: what is the world made of and how did the universe come to be the way it was. You will also understand the concepts of particles and antiparticles initially applied to specific particles (such as electrons, protons, and neutrons in the body) and their anti-particle equivalents (positrons, anti-protons, and anti-neutrons) and, the difference between particles and antiparticles that is generally compatible with laboratory findings.

Resnick Halliday and Walker fundamentals of physics volume 2 solutions ‘Quarks, Leptons, and the Big Bang’ has a total of 65 questions which are divided into 2 sets of exercises. The problem set is further divided into 4 modules that have questions based on defined concepts like Leptons and Quarks, The Interactions within Particles, Hadrons: Baryons and Mesons concept, and expansion of the universe. You will also get an idea of Hubble’s law. Since these issues have been answered in our Resnick Halliday and Walker Volume 2 Solutions, you should be able to overcome several other problems when planning Physics for JEE and NEET.

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Important Topics for Resnick Halliday & Walker Fundamentals of Physics Volume 2 Solutions Chapter 44: Quarks, Leptons, and the Big Bang

The main concepts of Resnick Halliday and Walker Fundamentals of Physics Volume 2 Solutions for Chapter 44 ‘Quarks, Leptons, and the Big Bang inform of the basics behind fundamental particles that are further divided into several broad categories and also get an idea about antiparticles and their counterparts, fermions. Consecutively we will discuss strong as well as weak forces within this chapter. After this, you can easily recognize that there are six leptons (including antiparticles) in three families with a separate form of the neutrino in each unit.

  • Leptons and Quarks Existing work supports the opinion that all matter consists of six types of leptons, 6 types of quarks, and 12 antiparticles, one referring from each lepton and quark. Many of these particles have quantum spin numbers equivalent to and are thus fermions (emitted photons with half-integer spin quantum numbers).
  • Interactions Objects of electrical charge communicate via the electromagnetic force by transferring simulated photons.
  • Interactions Objects of electrical charge communicate by electromagnetic force by sharing simulated photons.
  • Leptons may also communicate with each other and with quarks by low energy, by large W and Z particles as messengers. Quarks interact with each other by the power of light. Electromagnetic and weak forces are separate embodiments of the same force.
  • Three leptons (electron, muon, and tau) have an electrical charge equivalent to # 1e. There are indeed three uncharged neutrinos (called leptons), one referring to each of the leptons being charged. The antiparticles for the charged leptons have a positive value. For the antiquarks, all four algebraic signs are inverted.
  • Quarks: The 6 quarks (up, down, strange, charm, bottom, and top) each have a baryon number + 1/3 and a charge equivalent to either + 2/3″ e “of the odd quark has an anomaly -1 whereas the others all have an oddity 0. For antiquarks, these four algebraic signs are inverted.
  •  Hadrons: Baryons and Mesons Quarks merge as extremely interacting particles called hadrons. Baryons are hadrons with half-integer quantum spin numbers (1⁄2 or 3/2). Mesons are hadrons with an integer spin quantum number (0 or 1) and are therefore bosons. Baryons, they are fermions. Mesons have a baryon number equal to zero; baryons have a baryon number equal to ‘1 or ‘1. 
  • Quantum chromo mechanics indicates that potential quark configurations are either quark with an antiquark, three quarks, or three antiquarks (this assumption is compatible with the experiment).
  • Extension of the Universe Recent data indicates that the universe is growing, with distant galaxies travelling away from us at the rate v of Hubble’s law: v = Hr (Hubble’s Law).

Where we take H, the Hubble constant, to have the value H = 71.0 km / s, Mpc = 21.8 mm / s.l. The extension mentioned in Hubble’s law and the existence of pervasive microwave background radiation was revealed.

Discussion of Exercises of Resnick Halliday and Walker Fundamentals of Physics Volume 2 Solutions Chapter 44: Quarks, Leptons, and the Big Bang


The first set of exercises has 11 questions based on conservation laws (energy, angular momentum, charge, lepton number, linear momentum, baryon number) and calculations of path based on massive particles and least kinetic energy.

Module 1: General Properties of Elementary Particles

Module 1 has 10 questions that are based on positively and negatively charged pions problems, calculation of the number of proton decay. You will learn to solve problems related to the observation of neutrinos emitted by the supernova SN1987a and the calculation of momentum of the tau in kilogram-meters per second.

Module 2: Leptons, Hadrons, and Strangeness

Module 2 contains 13 questions based on the law of conservation, different charges on particles, baryon number, electron lepton number, spin angular momentum, strangeness, and muon lepton number. You will learn to calculate the disintegration energy of the given reactions.

Module 3: Quarks and Messenger Particles

Module 3 essentially contains 6 questions explaining to you the concept of quark combinations and will ask you about the quark combinations of the antiprotons as well as the antineutron.

Module 4: Cosmology

Module 4 contains 13 questions based on the concept of the quark model and Hubble’s law. This module will ask you to evaluate the critical density of a given value and Earth’s orbital speed under given configurations. Under this module, you are supposed to answer whether the universe continues to expand everlasting or not.

Additional Problems

The last section has additional problems and has a total of 9 questions. It incorporates all the hypotheses explored in the book like a particle game. These problems will ask you about the existence proof of antiprotons and how much energy will be emitted if the Planet was annihilated by an anti-Earth collision? This section will also ask you to identify the hypothetical proton decay scheme.

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