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30 January, 00:25

Question: Carbon-11 has a half-life of about 20 minutes. If we start with 200 grams, how

much will be left after 3 hours?

A. 25 grams

B. 2.5 grams

C. 0.39 grams

D. 0.039 grams

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Answers (1)
  1. 30 January, 03:33
    0
    C). 0.39 grams

    Step-by-step explanation:

    First find how many half-lifes are in 3 hours:

    3 hours : 20 minutes = 9 half-lifes

    Find the total left:

    0.5^9*200 ≈ 0.39
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