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Which definition describes a half-life?
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The time required for half of a radioactive sample to decay.
The time required for half of a radioactive sample to become unstable.
The time required for all of a radioactive sample to change because of heat.
The time required for all of a sample to break down due to pressure change.
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GinnyAnswer
The correct definition that describes a half-life is: 1. The time required for half of a radioactive sample to decay. In the context of radioactive decay, the half-life of a substance refers to the time it takes for half of the radioactive atoms in a sample to undergo radioactive decay. This means that after one half-life, half of the original radioactive atoms have decayed into stable atoms, while the other half remains radioactive. The concept of half-life is crucial in understanding the rate of decay of radioactive substances and is used in various scientific fields such as geology, archeology, and medicine.

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