A Rock Sample Contains 1/8 Micrograms of the Parent Radioactive

question 24

Multiple Choice

A rock sample contains 1/8 micrograms of the parent radioactive isotope Al-26 and 7/8 micrograms of its daughter isotope Mg-40. If the half-life of this decay is approximately 700,000 years, how old is this rock?

• A) 2.1 million years
• B) 2.8 million years
• C) 1.4 million years
• D) 700,000 years

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