11.3 Radioactive Half-Life

The Transmutation of Elements

Transmutation is a process in which a radioactive element transforms into another element. This occurs as there is a change in the number of protons in the atomic nucleus. Duration: 5:00.

Half-Life Is a Measure of Radioactivity

This video lesson explores the meaning of the term half-life, which is the time it takes for one half of a radioactive sample to decay. Duration: 5:54.

Radioactive Dating

Radiation from outer space causes the formation of radioactive carbon-14, which gets incorporated into the life cycle. How long ago an organism died can be estimated from a measure of the amount of carbon-14 remaining in the tissue of the organism. Duration: 4:56.