The Half-Life of Potassium-40 Is 1

question 24

Multiple Choice

The half-life of potassium-40 is 1.3 billion years. If a rock that formed 2.6 billion years ago originally contained 5 grams of potassium-40, about __________ grams of potassium-40 would be left in that rock today.

• A) 0.0125
• B) 0.125
• C) 1.25
• D) 0.25

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