Radioactivity

Front

What makes something radioactive?

Back

An unstable nucleus.

Front

What fraction of an isotope has decayed after 4 half-lives?

Back

15/16.

Front

What is an isotope?

Back

An atom with different amounts of neutrons.

Front

Energy in the sun is produced as a result of nuclear ____ reactions.

Back

Fusion.

Front

Name the type of radioactive particle that can be stopped by a sheet of paper.

Back

Alpha.

Front

What is radioactivity?

Back

The process by which unstable atomic nuclei lose energy by emitting radiation.

Front

What are the three main types of radiation?

Back

Alpha, beta, and gamma radiation.

Front

What is half-life?

Back

The time required for half of the radioactive atoms in a sample to decay.

Front

What type of radiation is the most penetrating?

Back

Gamma radiation.

Front

What is fission?

Back

The splitting of a heavy nucleus into two lighter nuclei, releasing energy.