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If a rock had 80 radioactive atoms in it when it was formed and it now has 40 radioactive elements in it, how old is the rock?

If a rock had 80 radioactive atoms in it when it was formed and it now has 40 radioactive elements in it, how old is the rock?
asked 194k views
23 votes
If a rock had 80 radioactive atoms in it when it was formed and it now has 40 radioactive elements in it, how old is the rock?

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User Bowmore
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7.3k points

1 Answer

13 votes

its 120 that hoow old it is

answered
User Ingemar
by
7.9k points
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