Q&A Hero

Physic

Q: What is meant by neutrino oscillations? a. oscillating movement of neutrinos b. one neutrino type (e.g., muon neutrinos) changing into another (e.g., tau neutrinos) c. random changes in mass of neutrinos d. none of the above
Q: Quarks, originally isolated in cosmic ray showers, are elementary particles possessing electric charge equal to 1/3 or 2/3 the magnitude of the charge of a proton.
Q: Mesons are composed of three-quark combinations.
Q: In a particle reaction, the number of baryons going into the reaction must equal the number emerging from the reaction..
Q: The spin of elementary particles is quantized.
Q: An elementary particle has a measurable size.
Q: All neutrinos are left handed.
Q: Recent experiments suggest that the lifetime of the proton is over 1033years, more than what is predicted by the simplest grand unified theories.
Q: According to the standard model of elementary particle physics, there are six flavors of quarks, each of which comes in three colors.
Q: The quark and antiquark in a meson are always of the same flavor.
Q: The color force is carried by gluons but gluons do not have color charge themselves.
Q: The color force between quarks is carried by mesons.
Q: There are three flavors of quarks.
Q: The quark structure of the neutron is udd.
Q: The quark structure of the proton is uud.
Q: Charm, beauty, and truth are three quantum numbers for quarks.
Q: All quarks have 1/3 the electric charge of an electron.
Q: Quarks are held together by the color force.Electrons are made of quarks.
Q: Leptons are the fundamental particles that are the building blocks of hadrons.
Q: Steven Weinberg, Abdus Salam, and Sheldon Glashow shared the 1979 Nobel prize in physics for their development of GUTs.
Q: Electroweak theory results in models for combining the electromagnetic, weak and strong nuclear interactions into a single basic force.
Q: The strong force depends upon the electric charge of the particles involved.
Q: Strangeness is conserved observed in strong and electromagnetic interactions, but not in weak interactions.
Q: Baryon number is conserved in all interactions.
Q: Some antiparticles are identical to the particles they correspond to.
Q: Every particle has a corresponding antiparticle.
Q: A photon is a boson.
Q: Bosons are force-carrying particles.
Q: Leptons are built out of quarks.
Q: A lepton interacts via the strong interaction.
Q: Hadrons are particles that interact via the strong force.
Q: Any particle with spin obeys the Pauli exclusion principle.
Q: A boson has half integral spin.
Q: A fermion has integral spin.
Q: Short range interactions generally have carrier particles of greater mass than those for long range interactions.
Q: The four fundamental forces in nature are the strong, weak, electromagnetic, and gravitational interactions.
Q: The speed of light is a relativistically invariant quantity.
Q: If a 1 kg mass is completely converted into energy, the amount of energy released would be 9ï‚´1016J.
Q: Because of time dilation, if a twin goes on a trip in a high speed rocket ship, when she returns home she will be younger than her twin sister who did not go on the trip.
Q: Because of their short lifetimes, very few muons that are produced in the upper atmosphere at high speeds should be observed at the surface of the earth. Yet we detect large numbers of muons at ground level because of the Pauli exclusion principle.
Q: According to special relativity, at speeds approaching the speed of light, the kinetic energy of a moving object is not equal to 1/2 mv2.
Q: Since the rest energy of an electron and its antiparticle a positron is 0.511 MeV, a gamma ray must have an energy larger than 1.022 MeV to produce an electron-positron pair.
Q: Because of the equivalence of energy and mass, a gamma ray, which is a high energy photon, can "disappear," and in its place there will be produced an electron and a positron, which both have mass.
Q: Because of the equivalence of mass and energy, an electron and a positron, which are two massive particles, can annihilate when they come together to produce two photons, which have no mass.
Q: Einstein's famous equation E0= mc2is a statement of the equivalence of energy and the square of the speed of light.
Q: Special relativity predicts that the length of a moving object will be elongated in the direction of motion.
Q: Special relativity predicts that moving clocks run slow.
Q: A gamma ray is another name for a(n) __________.
Q: A beta particle is another name for a(n) __________.
Q: An alpha particle is another name for a(n) __________.
Q: The symbol indicating the number of neutrons in a nucleus is __________.
Q: The symbol indicating the number of nucleons in a nucleus is __________.
Q: The symbol indicating the mass number of a nucleus is __________.
Q: The symbol indicating the number of protons in a nucleus is __________.
Q: The symbol indicating the atomic number of a nucleus is __________.
Q: Two isotopes have the same __________ number.
Q: The number of protons in a nucleus is the __________ number.
Q: Fuel rods in a nuclear reactor contain only about 3% uranium-235 and the remainder is mostly uranium-238. As the uranium-238 absorbs a neutron during reactions, it becomes uranium-239, which undergoes two beta decays to become plutonium-239.a. uranium-239 b. uranium-237 c. plutonium-239d. plutonium-238
Q: Of the thousands of different isotopes known to exist,a. most of them are radioactiveb. only a couple can be used to build an atom bombc. some are used in medical diagnosis and treatmentd. most occur naturallye. all of the above
Q: Cold fusion has a. solved the world's energy crisis b. been used to create superheavy elements c. been achieved using muons d. rendered nuclear reactors obsolete
Q: Fusion is used in a. atomic bombs b. power plants c. energy for stars d. hydrogen bombs e. a tokamak reactor
Q: Fission is used in a. atomic bombs b. power plants c. energy for stars d. hydrogen bombs e. a tokamak reactor
Q: Which of these is/are not true of nuclear fission reactors? a. Their intended output is heat. b. They produce the majority of the electric energy used in the world. c. There is a small chance one could explode like an atom bomb. d. Some can produce or "breed" more nuclear fuel than they consume.
Q: Why use nuclear power on a satellite?a. It can supply energy for many years on long space missions.b. Solar cells don"t work well in the outer solar system far from the sun.c. Sending radioactive materials into space is a good way to get rid of them so they don"t create a hazard on earth.d. all of the above
Q: What isotopes are used as nuclear reactor fuel?a. uranium-235 b. uranium-238 c. plutonium-239d. deuterium
Q: What sorts of materials serve as moderators in nuclear reactors?a. water b. boron c. graphited. concrete
Q: A magnetic field will deflect a(n)a. alpha particleb. beta particlec. gamma rayd. x raye. all of the above
Q: The expression(s) indicating the number of neutrons in a nucleus isa. Ab. Nc. Zd. Z +Ne. A -Z
Q: The expression(s) indicating the number of nucleons in a nucleus isa. Ab. Nc. Zd. Z +Ne. A -Z
Q: The expression(s) indicating the mass number of a nucleus isa. Ab. Nc. Zd. Z +Ne. A -Z
Q: How do isotopes of a given element differ?a. They have different mass numbers.b. They have different neutron numbers.c. They have different atomic numbers.d. They have different quantum numbers.e. none of the above
Q: Hydrogen bombs get most of their energy froma. the fission of hydrogen b. the fusion of hydrogen c. strong nuclear energyd. nuclear binding energy
Q: The nucleus of an atom is composed of protons and neutron held together by thea. binding energy b. strong nuclear force c. fusiond. fission
Q: The type of nuclear reaction taking place in stars is:a. cold fusion b. fusion c. fissiond. beta decay
Q: If one half life for an isotope is 25,000 years, then 10 half-lives would be _______ years.a. 2,500b. 25,000 c. 125,000d. 250,000
Q: Radioactive decay is involved in a. irradiating food to destroy harmful bacteria b. keeping the interior of the Earth hot c. making smoke detectors work d. finding flaws in jet engine parts e. all of the above
Q: Magnetic confinement is used in controlled fusion experiments to a. provide neutrons b. accelerate nuclei c. control a plasma d. excite nuclei into higher energy levels e. inject energy into nuclei
Q: The mass of an atom of carbon-12 (Z = 6) is less than the mass of 6 protons and 6 neutrons because of a. nuclear fission b. nuclear fusion c. neutron activation d. nuclear emission e. binding energy
Q: When uranium-238 (Z = 92) is bombarded with a neutron, it can change intoa. uranium-237b. uranium-239c. protactinium-239 (Z = 91)d. neptunium-239 (Z = 93)e. none of the above
Q: The determination of the composition of a material by bombarding it with neutrons and monitoring the emitted radiation is a. nuclear fission analysis b. nuclear fusion analysis c. neutron activation analysis d. nuclear emission analysis e. beta decay analysis
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