Physics for IGCSE & O level - Atoms And Radioactivity (Section 7 - No. 11)
What is half-life?
The time it takes for half of a radioactive sample to decay.
The time it takes for a sample to double its radioactivity.
The time it takes for all of a radioactive sample to decay.
The time it takes for a sample to lose all its mass.
Explanation
The half-life is the time it takes for half of a radioactive sample to decay.
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