Homer Says That We Can Safely Use Nuclear Power Because

question 71

Multiple Choice

Homer says that we can safely use nuclear power because all radioactive nuclei are gone after two half-lives. Marge says that only the decay rate is zero after two half-lives. Which one, if either, is correct, and why?

• A) Homer, because half of the nuclei disintegrate in each half-life.
• B) Marge, because the number of decays per unit time is halved in each half-life.
• C) Homer, because it's safe to handle radioactive substances after two half-lives.
• D) Both, because when all nuclei disintegrate the decay rate is also zero.
• E) Neither, because one quarter of the nuclei are left after two half-lives.

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