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OpenStudy (anonymous):
One scientist kept 20 grams of a radioactive material in a container. What will be the mass of the radioactive material left in the container after 2 half lives? 4 grams 5 grams 10 grams 40 grams
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OpenStudy (anonymous):
a half life is the amount of time it takes for a radioactive material to become half its original size. So for 1 half life, you would divide by 2, and for 2 half lives you would divide 2 and then 2 again, meaning you would divide by 4.
OpenStudy (anonymous):
so the answer is 5grams?
OpenStudy (anonymous):
???????
OpenStudy (anonymous):
sorry, had to take care of something. yes the answer is 5 grams.
OpenStudy (anonymous):
ok thanks
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