AQA GCSE Physics · 8463
Specification 4.4.2.3, 4.4.3.2, 4.4.3.3 · Paper 1
The time taken for the number of undecayed nuclei in a sample to halve, or for its activity or count rate to fall to half its initial level.
Revise: Half-lives and the random nature of radioactive decayA particular isotope has a constant half-life. Different isotopes can have very different half-lives. The constancy of half-life allows the behaviour of a large sample to be predicted even though the decay of any one nucleus remains unpredictable.
- Revise: Different half-lives of radioactive isotopes
The time taken for the number of undecayed radioactive nuclei in a sample, or its activity, to fall to half its initial value.
- Revise: Uses of nuclear radiation
The time taken for the number of undecayed radioactive nuclei, or the activity or count rate, to fall to half its initial value.