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In two half-lives, how much of a 400-gram sample of a radioactive element will remain un-decayed?
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In two half-lives, how much of a 400-gram sample of a radioactive element will remain un-decayed?

User Meadow
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1 Answer

2 votes

Answer:

100 grams

Explanation:

1/2 * 1/2 = (1/2)² = 1/4

1/4 * 400 = 100

User Thelandog
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