Enriching Uranium

What is the isotope of uranium that is sought after for nuclear power or weapons?

• U-235

• U-238

• U-239

• U-234

What percentage of uranium pulled out of mines is U-238?

• 90%

• 99.3%

• 0.7%

• 3%

What happens when U-235 splits?

• It absorbs low-energy thermal neutrons

• It releases energy and more neutrons

• It becomes stable

• It turns into U-238

What is the main challenge in enriching uranium?

• Decreasing the concentration of U-238

• Increasing the concentration of U-235

• Turning uranium into gas

• Using centrifuges

Which method was used by the Manhattan Project to enrich uranium?

• Electromagnetic separation

• Chemical reactions

• Centrifuges

• Gaseous diffusion

What is the purpose of spinning uranium hexafluoride in centrifuges?

• To separate U-235 from U-238

• To create weapons-grade uranium

• To produce depleted uranium

• To increase the concentration of U-238

At what enrichment level can centrifuges be rearranged to quickly produce weapons-grade uranium?

• 0.7%

• 3%

• 90%

• 20%

What is one of the most serious threats to the world?

• Greenhouse gas emissions

• Nuclear power plants

• Proliferation of nuclear weapons

• Depleted uranium

What is the potential benefit of nuclear power?

• Creating depleted uranium

• Producing weapons-grade uranium

• Increasing the concentration of U-235

• Providing energy without adding greenhouse gases

What is produced at the other end of the centrifuges?

• Depleted uranium

• Weapons-grade uranium

• U-238

• U-235