Concept explainers
Whether the leptons are heavier than protons or neutrons and explain the reason.
Answer to Problem 1CQ
The leptons are lighter than the protons and neutrons.
Explanation of Solution
The particles were grouped into three primary groups: leptons, mesons, and baryons. The leptons are the lightest particles and include electrons, positrons, and the neutrinos involved in beta decay.
Neutrons and protons occupy more volume than electron. Electron is a point particle and an elementary particle. Neutrons and the protons are baryons and they both will make some quarks, another quantum, another point particle.
Leptons are mostly lighter particles and they include the almost massless neutrinos, the electron and the muon. The heaviest of this group is the tauon and is almost twice the mass of the proton still.
Conclusion:
Therefore, leptons are the lighter particles than the protons and neutrons.
Want to see more full solutions like this?
Chapter 21 Solutions
Physics of Everyday Phenomena
- Which of the following decays cannot occur because die law of conservation of lepton number is violated? (a) np+e (e) e+ve (b) +e++ve(f) e+ve+v (c) +e++ve+v (g) 0+p (d) pn+e++ve (h) K+++varrow_forward1. In ATLAS, a proton with energy 6.5 TeV (6.5 × 101²eV) collides with another proton of the sam energy moving in the opposite direction. The proton mass is 938 MeV/c² (938 × 10ºeV/c²). a. Find the proton speed (in natural units). It will be very close to 1. e b. Write the total 4-momentum of the two-proton system in terms of the proton energy E.arrow_forward1. The velocity of an alpha particle, He²*, with mass m = 6.64×x10"kg changes from u1 = (-0.30, 0.45,0.10)c to U2 = (-0.50, 0.30, -0.75)c, where c=3x10®ms¯1 Determine the change in the particle's kinetic energy. (In the kinetic energy formula, do not forget to square the speed of light.) Answer: 1.2x109 of 2 308 words A General\All Employees (unrestricted) * Accessibility: Good to go D. Focus 188% 13°C 21 Rain 09 u) 2022 hp & 24 4. 6. 7. E R 00 (Farrow_forward
- q9arrow_forward3. Neutron-proton collisions: Suppose a proton (m, = 9.3827 · 10°eV/c] with velocity , = (c/2). and a neutron m, = 9.3957 - 10°eV/c) with velocity un = (-2c/5)a collide in your lab and form an excited deuterium nucleus with mass ma. What are (a) ma and (b) the deuterium nucleus' velocity %3D %3D Proton Neutron Lab Frame View before the collisonarrow_forward1. The tau lepton has a mass of ~2 GeV/c² and lives on average for 3x10-¹3s. If you try to measure its mass (i.e. rest energy), what is the best precision that you can obtain? The Z boson has a mass of ~90 GeV/c² and lives on average for 3x10-25 s. If you try to measure its mass, what is the best precision that you can obtain?arrow_forward
- The first step in the proton-proton chain produces an antielectron, or positron. What happens to the positron? A. It slowly works its way to the Sun’s surface, where it escapes into space. B. It rapidly escapes from the Sun, traveling into space at nearly the speed of light. C. It is rapidly converted to energy when it meets an ordinary electron, resulting in matter-antimatter annihilation. D. It quickly meets an ordinary electron, forming an electron-positron pair that remains stable. E. It joins with a nearby neutron to form a proton.arrow_forward8 and 9arrow_forwardAn Erbium-166 nucleus contains 68 protons. The atomic mass of a neutral Erbium-166 atom is 165.930u, where u = 931.5 MeV/c². In this question you may use that the mass of a proton is 938.27 MeV/c², the mass of a neutron is 939.57 MeV/e² and the mass of an electron is 0.511 MeV/c². i. Calculate the nuclear binding energy per nucleon, giving your answer in units of MeV. ii. Electrons with an energy of 0.5 GeV are scattered off the nucleus. Estimate the scattering angle of the first minimum in the resulting diffraction pattern. iii. Briefly comment on whether or not you expect this nucleus to be spherical, and what consequence this has for excited states of the nucleus in the collective model.arrow_forward
- 14. In the β+ decay of nitrogen-12 (12.01864 u) into carbon-12 (12.00000 u), a positron with energy of 11.0 MeVis emitted. What is the energy of the electron neutrino? Assume the mass of the positron is 5.485799 x 10-4 u(same as an electron).arrow_forwardWhat is the binding energy of 12C? The mass of an atom of 12C is 12 u (exactly), of an atom of 'H is 1.007825 u, and of a neutron is 1.0086649 u.arrow_forward10. An proton-antiproton pair is produced by a 1.95 x 10° MeV photon. What is the kinetic energy of the antiproton if the kinetic energy of the proton is 55.35 MeV? Use the following Joules-to-electron-Volts conversion 1eV = 1.602 x 10-19 J. The rest mass of a proton is 1.67 x 10-27 MeV kg. of19 0of19. 19 0of19 o0arrow_forward
- University Physics Volume 3PhysicsISBN:9781938168185Author:William Moebs, Jeff SannyPublisher:OpenStaxClassical Dynamics of Particles and SystemsPhysicsISBN:9780534408961Author:Stephen T. Thornton, Jerry B. MarionPublisher:Cengage LearningCollege PhysicsPhysicsISBN:9781938168000Author:Paul Peter Urone, Roger HinrichsPublisher:OpenStax College
- An Introduction to Physical SciencePhysicsISBN:9781305079137Author:James Shipman, Jerry D. Wilson, Charles A. Higgins, Omar TorresPublisher:Cengage LearningGlencoe Physics: Principles and Problems, Student...PhysicsISBN:9780078807213Author:Paul W. ZitzewitzPublisher:Glencoe/McGraw-HillHorizons: Exploring the Universe (MindTap Course ...PhysicsISBN:9781305960961Author:Michael A. Seeds, Dana BackmanPublisher:Cengage Learning