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If a radioactive substance's half-life is 20 years, how much of a 40-gram sample will be left after 60 years? A. 5 grams B. 10 grams C. 20 grams D. 30 grams
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If a radioactive substance's half-life is 20 years, how much of a 40-gram sample will be left after 60 years? A. 5 grams B. 10 grams C. 20 grams D. 30 grams

User Anar Bayramov
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2 Answers

5 votes

Answer:

c. 20

Step-by-step explanation:

User Thorinkor
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3 votes
60 years is three half life for the substance, so 40*1/2^3=5
User Alfonsoolavarria
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