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Biology, 26.01.2020 07:31 LilFlamingo247
Asample of radioactive material has a half life of 20 years and an activity level of 4 curies. after how many years will the activity level of the sample be at 0.25 curie?
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Asample of radioactive material has a half life of 20 years and an activity level of 4 curies. after...
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