A radioactive substance has a half-life of 2 years. How much of a 800 g sample remains after 6 years?
Answer and explanation
Correct answer: A. 100 g
- Step 1: 6 years is 3 half-lives, so g. Answer: 100 g. Why not the others: 266 g, 133 g and 770 g don't fit.
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