Suppose you start with 1 kilogram of a radioactive substance that has a half- life of 10 years. Which of the following statements will be true after 20 years pass?
A) You'll have 0.75 kilogram of the radioactive substance remaining.
B) You'll have 0.25 kilogram of the radioactive substance remaining.
C) All the material will have completely decayed.
D) You'll have 0.5 kilogram of the radioactive substance remaining.
Correct Answer:
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