Physics for IGCSE & O level - Atoms And Radioactivity (Section 5 - No. 5)
What is the definition of a half-life?
The time it takes for all of the radioactive material to decay.
The time it takes for half of the radioactive material to decay.
The time it takes for the material to become stable.
The time it takes for the material to produce energy.
Explanation
Half-life: time for half to decay.
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