Physics for IGCSE & O level - Atoms And Radioactivity (Section 1 - No. 9)
What does the term 'half-life' refer to?
The time it takes for half of the atoms in a sample to decay.
The time it takes for all the atoms to decay.
The time for all the atom to turn into Helium
The time in which the activity stops
Explanation
Half-life is the time required for half of a radioactive sample to decay.
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