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Physics, 29.01.2022 20:20 2sally2

A 60co source is labeled 4. 00 mci, but its present activity is found to be 1. 85×107 bq. (a) what is the present activity in mci? (b) how long ago did it actually have a 4. 00-mci activity?.

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A 60co source is labeled 4. 00 mci, but its present activity is found to be 1. 85×107 bq. (a) what i...
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