31.3 - Uranium Fission Flashcards Preview

Physics - Topic 31 - Cosmology > 31.3 - Uranium Fission > Flashcards

Flashcards in 31.3 - Uranium Fission Deck (7)
Loading flashcards...

Nuclei that have a high atomic number are rich in what?

Neutrons (and protons)


When a high neutron nucleus absorbs another neutron, what can it do?

Split into 2 fragments


What is a common result of this?

2 or 3 more neutrons being released, as well as the release of energy


What can the extra neutrons lead to?

A chain reaction


What is crucial about the neutrons in order for them to split a nucleus?

They must be slow-moving


How is this achieved in a nuclear reactor?

With a moderator


What is an issue with using uranium in power plants?

A very small fraction is the unstable uranium-235, most of it is the stable uranium-238, which is useless