Physics · Oct / Nov 2020 · Paper 12 · Question 39
5054Half-life
What is the definition of the half-life of a radioactive element?
- Ahalf of the time it takes for one atom to decay
- Bhalf of the time taken for all the atoms in a sample to decay
- Cthe time taken for half of the atoms in a sample to decay
- Dthe time taken for the nucleon number (mass number) to halve
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Correct answer: C. the time taken for half of the atoms in a sample to decay
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