7c: Fission and Fusion

What is nuclear fission?

• A large nucleus is split into two smaller nuclei and some neutrons
• A large atom is split into two smaller atoms and some neutrons
• Joining of two nuclei into one
• Joining of two atoms into one

What is nuclear fusion?

• A large nucleus is split into two smaller nuclei and some neutrons
• A large atom is split into two smaller atoms and some neutrons
• Joining of two nuclei into one
• Joining of two atoms into one

Nuclear fission happens when…

• a neutron collides with a nucleus
• two nuclei join together
• a neutron absorbs a nucleus
• a nucleus absorbs a neutron

A nuclear fission chain reaction happens when…

• a neutron released by fission collides a different nucleus.
• a neutron released by fission is absorbed by a daughter nucleus.
• a nucleus released by fission is absorbed by a different neutron.
• a neutron released by fission is absorbed by a different nucleus.

Control rods control the rate of fission by…

• being made of graphite
• uranium absorbing neutrons
• slowing down neutrons
• absorbing excess neutrons

Control rods are used to control the…

• rate of reaction
• rate of fission
• rate of fusion
• temperature of the coolant

Which of the following would be a suitable material for a moderator?

• Uranium
• Graphite
• Water
• Concrete
• Boron

Which of the following would be a suitable material for a control rod?

• Uranium
• Graphite
• Water
• Concrete
• Boron

Which of the following would be a suitable material to shield a nuclear reactor?

• Uranium
• Graphite
• Water
• Concrete
• Boron

Where is nuclear fusion found in nature?

• alpha decay
• fission
• fusion
• gamma decay