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

Question

Keenan Clarke

Geography

14 June, 20:26

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

+3

Answers (1)

Know the Answer?

Shyla Jennings · Answer 1

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.

Radioactive decay of 40K atoms in an igneousrock has resulted in a ratio of 25 percent 40Katoms 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

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