Nuclear Fission Concepts and Applications

The lecture covers fission energy and natural uranium reactors. It explains the fission process, energy release, and calculations involving uranium-235. The comparison of energy production from uranium and coal highlights uranium's efficiency. The lecture also discusses the natural uranium reactor, focusing on neutron moderation and the role of moderators in nuclear reactors.

What is the primary process involved in nuclear fission?

• Emission of electrons

• Splitting of a nucleus

• Absorption of neutrons

• Combining two nuclei

How many neutrons are typically released during the fission of a uranium nucleus?

• Two or three

• None

• Four

• One

Approximately how much energy is released per fission of uranium-235?

• 400 mega electron volts

• 300 mega electron volts

• 100 mega electron volts

• 200 mega electron volts

How much coal is required to produce the same energy as 1 kg of uranium-235?

• 1 kg

• 10 kg

• 2.5 million kg

• 5 million kg

What is the natural abundance of uranium-235?

• 0.72%

• 1.5%

• 5%

• 10%

What is the role of a moderator in a nuclear reactor?

• To slow down fast neutrons

• To absorb all neutrons

• To increase neutron speed

• To cool the reactor

Which type of neutrons have higher energy?

• Moderate neutrons

• Fast neutrons

• Thermal neutrons

• Slow neutrons

What is a key design consideration for nuclear reactors?

• Increasing reactor size

• Minimizing neutron loss

• Decreasing energy output

• Maximizing neutron loss

Who designed the first nuclear reactor?

• Enrico Fermi

• Niels Bohr

• Marie Curie

• Albert Einstein

What was used as a moderator in the first nuclear reactor?

• Graphite

• Boron

• Water

• Lead