Provide an appropriate response.A toxic radioactive substance with a density of 2 milligrams per square centimeter is detected in the ventilating ducts of a nuclear processing building that was used 47 years ago. If the half-life of the substance is 20 years, what was the density of the substance when it was deposited 47 years ago?
A. 25.49 mg/cm2
B. 0.39 mg/cm2
C. 2.69 mg/cm2
D. 10.2 mg/cm2
Answer: D
Mathematics
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