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The half-life of carbon-14 is 5,730 years. How many grams of parent material will remain from a 120-gram sample of carbon-14 after 2 half-lives?
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The half-life of carbon-14 is 5,730 years. How many grams of parent material will remain from a 120-gram sample of carbon-14 after 2 half-lives?

User Mario F
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After 2 half lives, one half of one half of the original material remains. That's one fourth. One fourth of 120 grams is 30 grams remaining.
User Chris Carruthers
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