AnswersFoothill-B Period-Chemistry-2627BHalf-LifeQuestion 20
20
QuizMultiple Choice

Half-Life

Question 20 • Foothill-B Period-Chemistry-26/27B

Which definition describes a half-life?

Answer
A
The time required for half of a radioactive sample to decay.
B
The time required for half of a radioactive sample to become unstable.
C
The time required for all of a radioactive sample to change because of heat.
D
The time required for all of a sample to break down due to pressure change.

Explanation

A half-life is the time it takes for half of the radioactive atoms in a sample to decay. The other choices describe becoming unstable or changes caused by heat or pressure, which are not what half-life means.

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