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12 Nov 2019
The activity of a sample of a radioactive isotope that decays into a stable nucleus fell from 137Bq to 125Bq during an hour. Calculate: the half-life of the isotope; the number of nuclei of the radioactive isotope in the sample at the beginning and end of the hour; the mean lifetime of a nucleus of the radioactive isotope; how long must elapse until just one radioactive nucleus is left in the sample.
The activity of a sample of a radioactive isotope that decays into a stable nucleus fell from 137Bq to 125Bq during an hour. Calculate: the half-life of the isotope; the number of nuclei of the radioactive isotope in the sample at the beginning and end of the hour; the mean lifetime of a nucleus of the radioactive isotope; how long must elapse until just one radioactive nucleus is left in the sample.
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Elin HesselLv2
15 Apr 2019