Suppose You Find a Rock That Contains Some Potassium- 40

question 10

Multiple Choice

Suppose you find a rock that contains some potassium- 40 (half- life of 1.3 billion years) . You measure the amount and determine that there are 5 grams of potassium- 40 in the rock. By measuring the amount of its decay product (argon- 40) present in the rock, you realize that there must have been 40 grams of potassium- 40 when the rock solidified. How old is the rock?

• A)2)6 billion years
• B)1)3 billion years
• C)3)9 billion years
• D)5)2 billion years
• E)none of the above

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