A Rock Sample Contains 1/4 Micrograms of the Parent Radioactive

question 54

Multiple Choice

A rock sample contains 1/4 micrograms of the parent radioactive isotope Potassium-40 and 3/4 micrograms of its daughter isotope Argon-40. If the half-life of this decay is 1.25 billion years, how old is this rock?

• A) 5.00 billion years
• B) 3.75 billion years
• C) 1.25 billion years
• D) 2.50 billion years

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