Activity 9: Radioactive Decay and Half Life

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Last updated 9:08 AM on 6/15/26

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half-life

length of time required for half of the radioactive atoms in a sample to decay

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radioactive dating

A technique used to determine the actual age of a fossil on the basis of the amount of a radioactive element it contains

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absolute dating

A technique used to determine the actual age of a fossil

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relative dating

Method of determining the age of a fossil by comparing its placement with that of fossils in other layers of rock