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
Correct Answer:
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