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4 December, 21:45

Radioactive decay of 40K atoms in an igneous

rock has resulted in a ratio of 25 percent 40K

atoms to 75 percent 40Ar and 40Ca atoms.

How many years old is this rock?

(1) 0.3 10^9 y (3) 2.6 10^9 y

(2) 1.3 10^9 y (4) 3.9 10^9 y

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Answers (1)
  1. 4 December, 23:48
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    Radioactive decay of 40K atoms in an igneous rock has resulted in a ratio of 25 percent 40K atoms to 75 percent 40Ar and 40Ca atoms. this rock 2.6 10^9 y years old. The answer is number 3. The rest of teh choices do not answer the question above.
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