Ifa rock had 80 radioactive atoms in it when it was formed and it now has 20 radioactive elements in it, how old is the rock?

asked Feb 5, 2022 105k views

11 votes

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6 votes

Answer:

100, it is 100 years old

Step-by-step explanation:

Rafael Carvalho answered Feb 7, 2022

6.1k points

9 votes

Answer:

10 million years

Step-by-step explanation:

John Smithers answered Feb 10, 2022

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