Radioactive Decay: Suppose the half-life of an isotope is 2 days. You purchase 10 grams of the isotope, but it was produced in a laboratory 4 days before it was delivered to you. How much of this isotope will you have 3 days after it was delivered to you?
A. more than 2.5 grams but less than 5 grams
B. 2.5 grams
C. more than 1.25 grams but less than 2.5 grams
D. 1.25 grams
E. less than 1.25 grams
Answer: E
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