Spec 1PH0
Revise Edexcel GCSE Physics 6.4.2 Half-life and its random nature with the revision guides.
Explain that the half-life of a radioactive isotope is the time taken for half the undecayed nuclei to decay or the activity of a source to decay by half. • Explain that it cannot be predicted when a particular nucleus will decay but half-life enables the activity of a very large number of nuclei to be predicted during the decay process.
