A rock sample contains 1/2 microgram of the parent radioactive isotope U-235 and 1/2 microgram of its daughter isotope Pb-207. If the half-life of this decay is 700 million years, how old is this rock?
A) 1400 million years
B) 2100 million years
C) 700 million years
D) 350 million years
Correct Answer:
Verified
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