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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?

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 105k views
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?

asked
User Dan Rasmuson
by
8.2k points

2 Answers

6 votes

Answer:

100, it is 100 years old

Step-by-step explanation:

answered
User Rafael Carvalho
by
9.1k points
9 votes

Answer:

10 million years

Step-by-step explanation:

answered
User John Smithers
by
9.1k points
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