Physics of Everyday Phenomena
9th Edition
ISBN: 9781259894008
Author: W. Thomas Griffith, Juliet Brosing Professor
Publisher: McGraw-Hill Education
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Question
Chapter 21, Problem 2CQ
To determine
Whether we consider the protons to be elementary particles that do not have any underlying structure and explain the reason.
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Students have asked these similar questions
1. If a proton is moving at very high speed, so that its kinetic energy is much greater
than its rest energy (mc²), can it then decay via p →n + n+?
2. What would an “antiatom," made up of the antiparticles to the constituents of normal
atoms, consist of? What might happen if antimatter, made of such antiatoms, came
in contact with our normal world of matter?
1. 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?
Match these particle physics descriptions
A class of particles that consist of two quarks
An electron is a member of this class of particles.
A proton is a member of this class of particles
A class of particles that experiences the weak but not the strong nuclear force.
A class of particles that consist of three quarks
A class of particles that experiences strong and weak nuclear forces.
1. Hadrons
2.Mesons
3.Baryons
4.Leptons
Chapter 21 Solutions
Physics of Everyday Phenomena
Ch. 21 - Prob. 1CQCh. 21 - Prob. 2CQCh. 21 - Prob. 3CQCh. 21 - Prob. 4CQCh. 21 - Prob. 5CQCh. 21 - Prob. 6CQCh. 21 - Prob. 7CQCh. 21 - How do we know that the universe is expanding?...Ch. 21 - Prob. 9CQCh. 21 - Prob. 10CQ
Ch. 21 - Prob. 11CQCh. 21 - Prob. 12CQCh. 21 - Describe two astronomical discoveries that provide...Ch. 21 - Prob. 14CQCh. 21 - Prob. 15CQCh. 21 - Prob. 16CQCh. 21 - Prob. 17CQCh. 21 - Prob. 18CQCh. 21 - Prob. 19CQCh. 21 - Prob. 20CQCh. 21 - Prob. 21CQCh. 21 - Prob. 22CQCh. 21 - Prob. 23CQCh. 21 - Prob. 24CQCh. 21 - Prob. 25CQCh. 21 - Prob. 26CQCh. 21 - Prob. 27CQCh. 21 - Prob. 28CQCh. 21 - The average distance from the sun to Venus is...Ch. 21 - Prob. 2ECh. 21 - The nearest star to our sun is a red dwarf named...
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- (a) A particle and its antiparticle are at rest relative to an observer and annihilate (completely destroying both masses), creating two (rays of equal energy. What is the characteristic (ray energy you would look for if searching for evidence of protonantiproton annihilation? (The fact that such radiation is rarely observed is evidence that here is very little antimatter in the universe.) (b) How does this compare with the 0.511MeV energy associated with electronpositron annihilation?arrow_forward. If the average lifetime of a proton was 1033 years, about how many protons would you have to assemble together and observe simultaneously to witness a total of 100 proton decays in one year? Explain the reasoning that led to your conclusion.arrow_forward(a) Calculate the approximate age of the universe from the average value of the Hubble constant, H0=20km/s . Mly. To do this, calculate the time it would take to travel 0.307 Mpc at a constant expansion rate of 20 km/s. (b) If somehow acceleration occurs, would the actual age of the universe be greater or less than that found here? Explain.arrow_forward
- (a) Do all particles having strangeness also have at least one strange quark in them? (b) Do all hadrons with a strange quark also have nonzero strangeness?arrow_forward(a) What particle has the quark composition u-u-d? (b) What should its decay made be?arrow_forwardThe total energy in the beam of an accelerator is far greater than the energy of the individual beam particles. Why isn't this total energy available to create a single extremely massive particle?arrow_forward
- How can quarks, which are fermions, combine to form bosons? Why must an even number combine to form a boson? Give one example by stating the quark substructure of a boson.arrow_forwardThe peak intensity of the CMBR occurs at a wavelength of 1.1 mm. (a) What is the energy in eV at a 1.1mm photon? (b) There are approximately 109 photons for each massive particle in deep space. Calculate the energy of 109 such photons. (c) If the average massive particle in space has a mass half that of a proton, what energy would be created by convening its mass to enemy? (d) Does this imply that space is “matter dominated”? Explain briefly.arrow_forward(a) Verify from its quark composition that the particle could be an excited state of the proton. (b) There is a spread of about 100 MeV in the decay energy of the interpreted as uncertainty due to its short lifetime. What is its approximate lifetime? (c) Does its decay proceed via the strong or weak force?arrow_forward
- Suppose you are designing a proton decay experiment and you can detect 50 percent of the proton decays in a tank of water. (a) How many kilograms of water would you need to see one decay per month, assuming a lifetime of 1031 y? (b) How many cubic meters of water is this? (c) If the actual lifetime is 1033 y, how long would you have to wait on an average to see a single proton decay?arrow_forward(a) A panicle and its antiparticle are at rest relative to an observer and annihilate (completely destroying both masses), creating two y rays of equal energy. What is the characteristic y -ray energy you would look for if searching for evidence of proton-antiproton annihilation? (The fact that such radiation is rarely observed is evidence that there is very little antimatter in the universe.) (b) How does this compare with the 0.511-MeV energy associated with electron-positron annihilation?arrow_forwardIf the Higgs boson is discovered and found to have mass, will it be considered the ultimate carrier of the weak force? Explain your response.arrow_forward
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