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The half-life of the radioactive element unobtanium-43 is 20 seconds. If 80 grams of unobtanium-43 are initially present, how many grams are present after 20 seconds? 40 seconds? 60 seconds? 80 seconds? 100 seconds?

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The half-life of the radioactive element unobtanium-43 is 20 seconds. If 80 grams of unobtanium-43...

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The​ half-life of the radioactive element unobtanium-43 is 20 seconds. If 80 grams of unobtanium-43 are initially​ present, how many grams are present after 20 ​seconds? 40 seconds? 60 seconds? 80 seconds? 100 seconds?

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The half-life of the radioactive element unobtanium-43 is 20 seconds. If 80 grams of unobtanium-43 are initially present, how many grams are present after 20 seconds? 40 seconds? 60 seconds? 80 seconds? 100 seconds?