Multiple Choice
A rock sample containing an isotope with a half-life of 12 million years has an initial mass of 72 grams. How much of the parent isotope will be present after three half-lives?
A) 4.5 grams
B) 9 grams
C) 18 grams
D) 54 grams
E) 63 grams
Correct Answer:
Verified
Correct Answer:
Verified
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