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==Key Stage 4 Foundation==
===Meaning===
[[File:HalfLifeGraph1.png|right|300px|thumb|A [[graph]] showing the [[fraction]] of [[Unstable Isotope|unstable isotope]] left compared to the '''half life'''.]]
A '''half life''' is the time it takes for half of the [[Unstable Isotope|unstable isotopes]] in a [[radioactive]] sample to [[Radioactive Decay|decay]].
==Key Stage 4 Higher==
===Meaning===
[[File:HalfLifeGraph1.png|right|300px|thumb|A [[graph]] showing the [[fraction]] of [[Unstable Isotope|unstable isotope]] left compared to the '''half life'''.]]
A '''half life''' is the time it takes for half of the [[Unstable Isotope|unstable isotopes]] in a [[radioactive]] sample to [[Radioactive Decay|decay]].