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- anonymous

A fossilized animal that was killed by a volcanic eruption has 6.25 percent of its original amount of carbon-14 remaining; this radioisotope has a half-life of 5730 years. How long ago did the volcano erupt?
34,380 years ago
22,920 years ago
17,190 years ago
9,168 years ago

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- Cuanchi

after 1 half-life the remained amount of C14 will be 50% of de original= 1/2
after 2 half-life the remained amount of C14 will be 50% of the 50% of the original= 1/4 =25%
after 3 half-life the remained amount of C14 will be 50% of the 25% of the original= 1/8 = 12.5%
after 4 half-life the remained amount of C14 will be 50% of the 12.5% of the original= 1/16 = 6.25 %
if 1 Half life is 5730 years
2 Half life is 2 x 5730 years
3 Half life is 3 x 5730 years

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