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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?
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11 votes
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?

User Dan Rasmuson
by
8.2k points

2 Answers

6 votes

Answer:

100, it is 100 years old

Step-by-step explanation:

User Rafael Carvalho
by
9.1k points
9 votes

Answer:

10 million years

Step-by-step explanation:

User John Smithers
by
9.1k points
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