The amount of a radioactive material (having a half life of 100 years) remaining after 400 years will be ______________ of its original weight?
Correct answer: D. 1/16
- A. 1/2
- B. 1/4
- C. 1/8
- D. 1/16
Explanation
Four half-lives pass in 400 years because 400/100 = 4. The remaining fraction is (1/2)^4 = 1/16 of the original amount.
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