Suppose You Find a Rock That Contains 10 Micrograms of Radioactive

question 10

Multiple Choice

Suppose you find a rock that contains 10 micrograms of radioactive potassium-40,which has a half-life of 1.25 billion years.By measuring the amount of its decay product (argon-40) present in the rock,you conclude that there must have been 80 micrograms of potassium-40 when the rock solidified.How old is the rock?

• A)1.25 billion years
• B)2.5 billion years
• C)3.75 billion years
• D)5.0 billion years

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