Physics for IGCSE & O level - Atoms And Radioactivity (Section 8 - No. 14)
What is the half-life of a radioactive substance?
The time for the activity to double.
The time for the activity to halve.
The time for all the substance to decay.
The time for the sample to cool.
Explanation
The half-life is the time it takes for half the substance to decay.
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