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11. Carbon-14 has a half-life of 5760 years. A 1-gram sample of an ancient pine spear...

11. Carbon-14 has a half-life of 5760 years. A 1-gram sample of an ancient pine spear contains 1/8 as much carbon-14 as is present in a modern pine branch.

(a) Approximately how old is the spear?

(b) If a spear were 100,000 years old, why would carbon dating be inadequate for dating it?

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