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Question 6.2.3: The activity of a sample is initially 80 decays per minute. ...

The activity of a sample is initially 80 decays per minute. It becomes 5 decays per minute aiter 4 h. What is the half-life?

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The activity is reduced from 80 to 5 decays in 4 half-lives. The half-life is 1 h.

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