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Question 6.2.4: The activity of a sample is 15 decays per minute. The half-l...

The activity of a sample is 15 decays per minute. The half-life is 30 min. When was the activity 60 decays per minute?

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One half-life before the sample was given to us the activity was 30 decays per minute and one half-life before that it was 60 decays per minute, that is 60 minutes before.

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