A rock had originally 4500 atoms of U-238 and no Pb-206. U-238 decays into Pb 206 with a half life of 4.5 billion years. The rock now has 500 atoms of U-235. How old is it? O 3 billion years O 4.5 billion years 14.2 billion years 9 billion years

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A rock had originally 4500 atoms of U-238 and no Pb-206. U-238 decays into Pb 206 with a half
life of 4.5 billion years. The rock now has 500 atoms of U-235. How old is it?
O 3 billion years
4.5 billion years
O 14.2 billion years
O 9 billion years
Transcribed Image Text:A rock had originally 4500 atoms of U-238 and no Pb-206. U-238 decays into Pb 206 with a half life of 4.5 billion years. The rock now has 500 atoms of U-235. How old is it? O 3 billion years 4.5 billion years O 14.2 billion years O 9 billion years
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