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motikmotik
3 years ago
14

What percentage of coral reefs have scientists estimated to be completely gone?

Advanced Placement (AP)
2 answers:
alexira [117]3 years ago
3 0
I think it’s D hope that helped
Rufina [12.5K]3 years ago
3 0
I’m fairly certain it is 18%
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The half-life of carbon-14 is about 5700 years. If you left those 100 carbon-14 atoms to sit around for 5700 years, how many wou
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Answer:

50 atoms of carbon-14

Explanation:

From the question given above, the following data were obtained:

Original amount (N₀) = 100 atoms

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Time (t) = 5700 years

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Next, we shall determine the number of half-lives that has elapse. This can be obtained illustrated below:

Half-life (t½) = 5700 years

Time (t) = 5700 years

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N = 1/2¹ × 100

N = 1/2 × 100

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Original amount (N₀) = 100 atoms

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Amount that decay =?

Amount that decay = N₀ – N

Amount that decay = 100 – 50

Amount that decay = 50 atoms

Therefore, 50 atoms of carbon-14 have decayed during the time.

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