Radioactive Decay: The half-life of a radioactive material is 4.5 days. How many days are required for a sample, with an initial activity of 1.0 × 105 Bq, to decay to an activity of 100 Bq?
A. 45 days
B. 36 days
C. 54 days
D. 31 days
Answer: A
Physics & Space Science
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