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A sample of radioactive isotope is found to have an activity of 113 Bq imediately after it is pulled from the reactor that formed the
A sample of radioactive isotope is found to have an activity of 113 Bq imediately after it is pulled from the reactor that formed the isotope. Its activity 3 h, 5 min later is measured to be 83.8 Bq.
How many radioactive nuclei were there in the sample initially?
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