A half-life is ________

Question

Quizplus · Accepted Answer

A half-life is the time required for half of the unstable nuclei in a sample to decay. Therefore, option C is the correct answer. Option A is incorrect because a nuclear chemist's life is relevant to the topic of nuclear chemistry; however, it is not a definition of half-life. Option B is incorrect because it suggests that lifetime and half-life are interchangeable terms, which is false. Option D is incorrect because half-life is a constant for a given radioactive substance. Option E is incorrect because the half-life is determined by the rate constant for decay.

A Half-Life Is ________