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A Viking campfire was found to have a percentage of 88.6 percent of C14 in 1965. The amount of C14 decreases exponentially with a half-life of 5550 years. What then, was the approximate date of the Viking visit?
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This job shows a Viking calculation.
C14 has a half-life of 5550 years so we must assume that after starting with 100% C14 it will take 5550 years to decrease to 50%. ...