Physics 2020 M12 HW

Nuclear reactors that produce consumer power in present times are powered by: fission. fusion. both fission and fusion.

Detonation of a fusion-type hydrogen bomb begins by: igniting a fission bomb. pressing together pieces of uranium. splitting uranium. all of the above none of the above

An element is changed into a completely different element in: radioactive alpha decay. nuclear fusion. radioactive beta decay. nuclear fission. all of the above

Both, deuterium and tritium: are isotopes of the same element. have same chemical properties both of these neither of these

When two light atoms fuse together, mass: converts to high-energy gamma radiation. converts to kinetic energy. is created from energy of other forms. is gained.

Various singly-ionized atomic nuclei of the same speed are directed into a magnetic field in a mass spectrometer where they are deflected and strike a detecting screen. The particles most strongly deflected are those of: greatest mass. least mass. same for all

Control is maintained in a nuclear reactor by control rods that: emit fast neutrons. absorb excess neutrons. both of these neither of these

Which of these nuclei has the least mass?: uranium iron hydrogen lead all the same

Early 21st Century research in nuclear fusion uses: ultra-hot plasmas. laser beams. both of these neither of these

Compared with the mass of a uranium nucleus before splitting, the split fragments have: the same mass. more mass. less mass.

What is the central equation of mass-energy equivalence?: W = Fd E = mc^2 m = F/a KE = ½ mv^2

Compared with protons, neutrons are more effective nuclear bullets in nuclear reactions since they have: no charge. a wider cross-section than a proton. slightly greater mass than a proton. all of the above none of the above

In the fissioning of uranium, a chain reaction is caused by: the kinetic energy of the decay products. alpha particles. ejected neutrons. none of the above

The nuclear process having by-products with least radioactivity is: fusion. fission. about the same for both.

The percentage of electricity from nuclear power generated in recent decades in the United States has been about: less than 10%. 20%. 30%. more than 60% 40%.

Earth's interior is warmed by ________ and Earth's surface is warmed by ________. : volcanoes; solar energy radioactive processes; fusion in the Sun terrestrial radiation; terrestrial radiation fission; fossil fuels

Sustained energy output by fusion is a daily occurrence in: the Sun. Earth's interior. breeder reactors. military installations.

A nuclear power plant is very similar to: a photovoltaic solar cell power plant. any conventional power plant, but with uranium as fuel. nuclear bombs, but with more control. all of the above none of the above

The disadvantages to fission power plants include: risk of accidental release of radioactivity. radioactive waste disposal. production of plutonium for possible weapons proliferation. all of the above none of the above

If gold were used as nuclear fuel, it would be best: fused. fissioned. either of these

Relative to a fossil-fuel plant, a nuclear power plant produces: less smoke. less air pollution. all of the above none of the above

Energy released by the Sun results from the process wherein atomic nuclei: break apart. combine. both of these neither of these

Fissioning an iron nucleus would occur with: release of energy. absorption of energy. neither absorption nor release of energy

Between the processes of nuclear fission and fusion, radioactive by-products are more characteristic of nuclear: fusion. fission. both of these neither of these

When U-235 undergoes fission, the total number of protons in the fragments is: 90. 93. 92. 91. none of the above