Question 139A half-life is the amount of time that it takes for a radi

1.	Question 139A half-life is the amount of time that it takes for a radioactive substance to decay one-half of its original quantity.Suppose radioactive decay causes 300 grams of a substance to decrease 300×2−3 grams after 3 half-lives. Evaluate 300×2−3 to determine how many grams of the substance is left.Explain why the expression 300×2−n can be used to find the amount of the substance that remains after n half-lives.
Answer» Question 139 A half-life is the amount of time that it takes for a radioactive substance to decay one-half of its original quantity. Suppose radioactive decay causes 300 grams of a substance to decrease $300 \times 2^{- 3}$ grams after 3 half-lives. Evaluate $300 \times 2^{- 3}$ to determine how many grams of the substance is left. Explain why the expression $300 \times 2^{- n}$ can be used to find the amount of the substance that remains after n half-lives.

Question 139A half-life is the amount of time that it takes for a radioactive substance to decay one-half of its original quantity.Suppose radioactive decay causes 300 grams of a substance to decrease 300×2−3 grams after 3 half-lives. Evaluate 300×2−3 to determine how many grams of the substance is left.Explain why the expression 300×2−n can be used to find the amount of the substance that remains after n half-lives.

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Question 139

A half-life is the amount of time that it takes for a radioactive substance to decay one-half of its original quantity.

Suppose radioactive decay causes 300 grams of a substance to decrease $300 \times 2^{- 3}$ grams after 3 half-lives. Evaluate $300 \times 2^{- 3}$ to determine how many grams of the substance is left.

Explain why the expression $300 \times 2^{- n}$ can be used to find the amount of the substance that remains after n half-lives.

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