Radioactivity Revision Recall Quiz 1

What happens to a nucleus when it emits a gamma ray?

• Its mass decreases

• Its mass and charge remain unchanged

• Its charge decreases

What happens in nuclear fusion?

• One heavy nucleus emits a beta particle.

• One heavy nucleus splits into two lighter nuclei.

• Two light nuclei combine to form a heavier nucleus.

What is the role of the shielding around a nuclear reactor?

• To absorb the ionising radiation released during fission.

• To prevent background radiation from entering the reactor.

• To keep the reactor cool.

• To slow fast moving neutrons

Which type of radiation can penetrate the furthest into materials?

• Alpha

• Beta

• Gamma

An object has been irradiated if ...

• it has been exposed to a radioactive source.

• unwanted radioactive atoms have got on to or into it.

• it has become radioactive.

What is the name for atoms with the same number of protons but different numbers of neutrons?

• Ions

• Isomers

• Isotopes

What are the fission products of a uranium-235 nucleus?

• One radioactive daughter nuclei and a large number of neutrons.

• Two radioactive daughter nuclei and a small number of neutrons.

• Two radioactive daughter nuclei only.

Nuclear fusion does not happen at low temperatures and pressures, due to electrostatic repulsion of ...

• electrons.

• protons.

• neutrons.