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If half the K-40 of a rock has decayed into Ar-40, how old is the rock?
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If half the K-40 of a rock has
decayed into Ar-40, how old is
the rock?

User Enya
by
5.8k points

1 Answer

5 votes

Answer:

20

Step-by-step explanation:

40:2=20

User JofryHS
by
6.0k points
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