Determine half-life from a decay graph.

Within Half-lives and the random nature of radioactive decay, this learning objective asks you to determine half-life from a decay graph. Focus on the approved ideas half-life, graph and connect them clearly to Atoms and nuclear radiation. A strong response should state the relevant particle, radiation, isotope, decay, half-life or nuclear-equation idea, then explain how it answers the exact command word. Avoid swapping nearby concepts such as atomic number and mass number, isotope and ion, alpha, beta and gamma radiation, or contamination and irradiation.