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You have 80 grams of a radioactive kind of europium. If its half-life is 9 years, how much will be left after 27 years?

Sagot :

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Answer:

  10 g

Step-by-step explanation:

27 years is 3 times the 9-year half-life. This means the quantity remaining has been cut in half 3 times:

  ((80×1/2)×1/2)×1/2 = 10 . . . . grams

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