Answer:
A. The time required for half of a radioactive sample to decay.
Explanation:
Got it right on E2020 C:
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The statement that describes a half-life is "The time required for half of a radioactive sample to decay."
The half-life of a quantity is the time it takes for it to decline to half of its original value. In terms of chemical reaction, the half-life is defined as the time it takes for the reactant concentration to reach half of its initial value. It is commonly represented in seconds and is symbolized by the sign 't 1/2'.
The time it takes for one-half of the atomic nuclei in a radioactive sample to decay in radioactivity.
Hence the correct option is the time required for half of a radioactive sample to decay.
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