Multiple Choice
A certain radioactive isotope has a half-life of 14 years. If 19 grams of the isotope are left after 5 years, how much was present at the beginning?
A) 27.21 grams
B) 24.34 grams
C) 22.10 grams
D) 26.55 grams
E) 34.75 grams
Correct Answer:
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