Nuclear Fission

Question 1

Nuclear Fission

Answer 1

A large unstable nucleus absorbs a neutron causing it to split in two, releasing lots of energy an extra neutrons

Question 2

Chain reaction

Answer 2

In a bomb this chain reaction is allowed to ‘run away’

in a nuclear reactor that Chain Reaction is controlled so that one fission causes one more fission

Question 3

Induced

Answer 3

A neutron is fired at the unstable substance inducing fission

Question 4

Pros of nuclear fission

Answer 4

Energy released is 3 to 4 million times that produced by an equivalent mass of coal
Does not contribute to global warming

Question 5

Cons of nuclear fission

Answer 5

Waste products of the fission reaction are highly radioactive
Alpha and beta emmitors

Question 6

Gas cooled reactor

Uranium fuel rods

Answer 6

Usually enriched uranium

Make unranium 238 to 235

Question 7

Gas cooled reactor

Graphite moderator

Answer 7

Slows down emitted neutrons so that they can be used to start further fission reactions

Question 8

Gas cooled reactor

Boron control rods

Answer 8

Can be lowered between the fuel rods to absorb emitted neutrons and prevent further fission
Usually boron

Question 9

Gas cooled reactor

Cold gas

Answer 9

Flows around the reactor to remove the heat from the reaction
Could be water

Question 10

Gas cooled reactor

Shielding

Answer 10

Thick concrete surrounding the reactor that absorbs radiation
Most likely to be aske