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    Exam 8: Clocks in Rocks: Timing the Geologic Period
  5. Question
    A Radioactive Element Inside Has Been Decaying for 2 Million
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A Radioactive Element Inside Has Been Decaying for 2 Million

Question 21

Question 21

Multiple Choice

A radioactive element inside has been decaying for 2 million years? Given that the half-life is 500,000 years,what percent of the parent is currently left?


A) 90%
B) 50%
C) 25%
D) 6%

Correct Answer:

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