The Half-Life for Radioactive Decay of Potassium into Argon Is

question 28

Multiple Choice

The half-life for radioactive decay of potassium into argon is 1.3 billion years.A rock is found with 10 atoms of potassium and 90 of argon.What can we say about the age of the rock?

• A)It formed less than a billion years ago
• B)It formed about 1.3 billion years ago
• C)It is much older than 1.3 billion years
• D)It is much older than 20 billion years

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