Q&A Hero

Physic

Q: What do "kiloton" and "megaton" refer to?a. explosive yields of nuclear weaponsb. kiloton means 1000 tons of TNTc. megaton means one million tons of TNTd. all of the above
Q: Which of the following is not the usual outcome of nuclear fission? a. The binding energy per nucleon of the fission fragments is smaller than that of the original nucleus. b. Energy is released. c. Neutrons are released. d. The fission fragments are radioactive.
Q: The combining of two nuclei to form a larger nucleus with the release of energy is a. nuclear fission b. nuclear fusion c. neutron activation d. nuclear emission e. beta decay
Q: The splitting of a large nucleus into two smaller nuclei upon absorbing a neutron is a. nuclear fission b. nuclear fusion c. neutron activation d. nuclear emission e. beta decay
Q: How tightly the nucleons in a nucleus are bound together is indicated by the nucleus's a. atomic number b. mass number c. neutron number d. half life e. binding energy
Q: What do you do to the control rods of a reactor in order to shut it down? a. push them into the core b. pull them out of the core c. nothingit's the cooling water that shuts down the reactor d. none of the above
Q: Which of the following is not a method of producing nuclear fusion? a. heating a magnetically confined plasma b. forcing nuclei together using lasers c. cooling nuclei to very cold temperatures d. forcing nuclei together with a nuclear fission explosion
Q: The hydrogen in the universe was formed by a. the energy of the Big Bang b. nuclear fusion reactions in stars c. radioactive decay of heavy elements d. none of the above
Q: Carbon-14 dating can be used to find the age of material up to ____________ of years old. a. millions c. hundreds of thousands b. billions d. tens of thousands
Q: The Voyager space probes used electricity provided by a. fuel cells b. solar arrays c. radioisotope thermoelectric generators d. hydrazine e. none of the above
Q: A Geiger counter registers a count rate of 8,000 counts per minute from a sample of a radioisotope. The count rate 24 minutes later is 1,000 counts per minute. The half life of the radioisotope is a. 3 minutes b. 4 minutes c. 6 minutes d. 8 minutes e. 12 minutes
Q: The half life of uranium-232 is 70 years. The time for 3/4 of a sample of uranium-232 to decay is a. 35 years b. 70 years c. 125 years d. 140 years e. none of the above
Q: The time interval during which a nucleus has a 50% probability of decaying is its a. half life b. decay time c. nuclei activation time d. binding energy time e. none of the above
Q: When a nucleus in an excited state decays to the ground state, the particle emitted is a(n) a. alpha particle b. beta particle c. gamma ray d. x ray e. none of the above
Q: When a neutron decays to create a proton, another particle emitted is a(n) a. alpha particle b. beta particle c. gamma ray d. x ray e. none of the above
Q: What's a decay chain? a. a nuclear chain reaction b. one radioisotope decaying into another, which decays into another, and so on c. the triggering of multiple fissions by a single neutron d. none of the above
Q: When sulfur-35 (Z = 16) decays to chlorine-35 (Z = 17), a particle emitted is a(n) a. alpha particle b. beta particle c. gamma ray d. x ray e. none of the above
Q: When radium-223 (Z = 88) decays to radon-119 (Z = 86), the other particle emitted is a(n) a. alpha particle b. beta particle c. gamma ray d. x ray e. none of the above
Q: Why is there a radioactive source in a smoke detector? a. It makes the smoke particles radioactive. b. It ionizes the air. c. It powers the alarm when the battery wears out. d. none of the above
Q: What does the moderator do in a nuclear reactor? a. It is a safety feature that limits the nuclear reaction. b. It absorbs neutrons. c. It slows down neutrons. d. none of the above
Q: Why is nuclear reactor waste radioactive? a. Radiation from the reactor makes everything in or near it radioactive. b. Used fuel rods contain fission fragments which are radioactive. c. Spent fuel rods pick up contamination from the reactor. d. all of the above
Q: Low levels of ionizing radiation a. are dangerous to the human body b. can be tolerated by the human body c. are beneficial to the human body d. none of the above
Q: If a substance is radioactive it is definitelya. dangerousb. emitting alpha particlesc. glowingd. usefule. all of the abovef. none of the above
Q: A gamma ray is another name for a(n) a. electron b. proton c. neutron d. helium nucleus e. photon
Q: How can an electron be ejected from a nucleus in beta decay if it wasn"t in the nucleus to begin with? a. The electron doesn"t come from the nucleusit comes from an orbit circling the nucleus. b. A neutron in the nucleus turns into a proton, electron, and a neutrino. c. A proton in the nucleus turns into a neutron, electron, and a neutrino. d. none of the above
Q: A beta particle is another name for a(n) a. electron b. proton c. neutron d. helium nucleus e. photon
Q: An alpha particle is another name for a(n) a. electron b. proton c. neutron d. helium nucleus e. photon
Q: What is ? a. There is no such thing. b. an isotope of carbon with 7 neutrons and 12 protons c. an isotope of carbon with 7 neutrons and 5 protons d. an isotope of carbon with 5 neutrons and 7 protons
Q: If someone tells you they have a sample of niobium-90, can you tell how many neutrons are in the nucleus? a. Yes, there are 41 neutrons. b. Yes, there are 90 neutrons. c. Yes, there are 49 neutrons. d. No, more information must be given. e. No, there is no such thing as "niobium."
Q: What does the 235 represent in uranium-235?a. the mass number b. the atomic number c. the neutron numberd. none of the above
Q: The expression(s) indicating the number of protons in a nucleus isa. Ab. Nc. Zd. Z +Ne. A -Z
Q: The expression(s) indicating the atomic number of a nucleus isa. Ab. Nc. Zd. Z +Ne. A -Z
Q: What holds the nucleus together? a. electrical forces between the protons b. alpha particles c. beta particles d. strong forces
Q: How big is the nucleus of an atom? a. about 1% of the volume of the whole atom b. about a millionth of the volume of the whole atom c. about a billionth of the volume of the whole atom d. about a trillionth of the volume of the whole atom
Q: Two isotopes have the samea. mass numberb. neutron numberc. atomic numberd. quantum numbere. none of the above
Q: The number of protons in a nucleus is thea. mass numberb. neutron numberc. atomic numberd. isotope numbere. none of the above
Q: What's an isotope?a. a radioactive materialb. an atom of an element with a different number of neutrons in the nucleusc. an electrically charged atomd. none of the above
Q: An alpha particle is like with 2 protons and 2 neutrons, whereas a beta particle is equivalent to hydrogen.
Q: Einstein's equation E = mc2 states that when a particle loses energy, the result is an increase in mass of the particle.
Q: After three half-lives, 3/4 of the nuclei in a sample of a radioisotope have decayed
Q: The energy of nuclear radiation as it is absorbed mostly goes to heat the material.
Q: A nuclear reactor could explode like an atomic bomb.
Q: Magnetic confinement is used in controlled fusion experiments to control a plasma.
Q: The mass of an atom of carbon-12 (Z = 6) is less than the mass of 6 protons and 6 neutrons because of binding energy.
Q: When uranium-238 (Z = 92) is bombarded with a neutron, it can change into uranium-237.
Q: The product of a radioactive decay is called the "daughter."
Q: Gamma radiation is used to kill harmful bacteria in food.
Q: The determination of the composition of a material by bombarding it with neutrons and monitoring the emitted radiation is neutron activation analysis.
Q: The average mass of each neutron in the nucleus of an iron atom is not the same as the average mass of each neutron in the nucleus of a gold atom.
Q: Nuclear fusion is the source of energy in stars.
Q: Both nuclear reactors and atomic bombs use nuclear chain reactions.
Q: Atomic bombs and nuclear power plants both use nuclear fusion.
Q: The combining of two nuclei to form a larger nucleus with the release of energy is nuclear fusion.
Q: The splitting of a large nucleus into two smaller nuclei upon absorbing a neutron is nuclear fusion.
Q: The half life indicates how tightly the nucleons in a nucleus are bound together.
Q: The hydrogen in the universe was formed by the energy of the Big Bang.
Q: Carbon-14 dating can be used to find the age of material up to millions of years old.
Q: Fission fragments are always identical.
Q: Fusion is used to produce the largest nuclei known to exist.
Q: Fusion of hydrogen nuclei is the origin of solar energy.
Q: The Voyager space probes used electricity provided by solar arrays.
Q: A Geiger counter registers a count rate of 8,000 counts per minute from a sample of a radioisotope. The count rate 24 minutes later is 1,000 counts per minute. The half life of the radioisotope is 8 minutes.
Q: The half life of uranium-232 is 70 years. The time for 3/4 of a sample of uranium-232 to decay is 105 years.
Q: If one waits for a time equal to two half-lives for a certain radioactive material, all of it originally present will have decayed completely.A
Q: The time interval during which a nucleus has a 50% probability of decaying is its half life.
Q: The number of protons in a nucleus equals the number of neutrons.
Q: When a nucleus in an excited state decays to the ground state, a beta particle is emitted.
Q: When a neutron decays to a proton, a beta particle is emitted.
Q: When sulfur-35 (Z = 16) decays to chlorine-35 (Z = 17), an alpha particle is emitted.
Q: When radium-223 (Z = 88) decays to radon-119 (Z = 86), an alpha particle is emitted.
Q: Alpha, beta, and gamma particles are all deflected by a magnetic field.
Q: A gamma ray is another name for an electron.
Q: A beta particle is another name for a helium nucleus.
Q: In the case of alpha decay, the atomic number of the nucleus increases.
Q: Helium always has two neutrons in its nucleus.
Q: An alpha particle is another name for a helium nucleus.
Q: The symbol indicating the number of neutrons in a nucleus is N.
Q: The symbol indicating the number of nucleons in a nucleus is N.
Q: The symbol indicating the mass number of a nucleus is A.
Q: The symbol indicating the number of protons in a nucleus is N.
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