Carbon-14 has a half-life of 5,730 years. A fossil is found that has 28% of the carbon-14 found in a living sample. How old is the fossil? (Round your answer to the nearest year.)
carbon-14 has half-life 5730 years
let after t years the fossil has 28% carbon-14
let the carbon-14 decay function is where Po is the initial amount , k is the decay constant & t is in years
thus after 10523 years the fossil would have 28% carbon-14
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