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3 years ago

6

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 g

rams C. 20 grams D. 30 grams

2 answers:

satela [25.4K]3 years ago

8 0

Answer:

c. 20

Explanation:

tatiyna3 years ago

6 0

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

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