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Unformatted text preview: Every radioactive element has a half-life, which is the required time for a given quantity of that element to decay to half of its original mass. 5.6.10 A certain radioactive isotope has leaked into a small stream. On hundred days after the leak, 12% of the original amount of the substance remained. Determine the half-life of the radioactive isotope. 5.6.12 A superhero is rendered powerless when exposed to 60 or more grams of a certain element. A 650-year-old rock that originally contained 400 grams of this element was recently stolen from a rock museum by the superhero’s nemesis. The half-life of the element is known to be 250 years. a) How many grams of the element are still contained in the stolen rock? b) For how many years can this rock be used by the superhero’s nemesis to render the superhero powerless?...
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