Question 140(ii) Consider a quantity of a radioactive substance. The f

1.	Question 140(ii) Consider a quantity of a radioactive substance. The fraction of this quantity that remains after t half-lives can be found by using the expression 3−t. After how many half-lives will the fraction be 1243 of the original?
Answer» Question 140(ii) Consider a quantity of a radioactive substance. The fraction of this quantity that remains after t half-lives can be found by using the expression $3^{- t}$ . After how many half-lives will the fraction be $\frac{1}{243}$ of the original?

Question 140(ii) Consider a quantity of a radioactive substance. The fraction of this quantity that remains after t half-lives can be found by using the expression 3−t. After how many half-lives will the fraction be 1243 of the original?

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Question 140(ii)

Consider a quantity of a radioactive substance. The fraction of this quantity that remains after t half-lives can be found by using the expression $3^{- t}$ .
After how many half-lives will the fraction be $\frac{1}{243}$ of the original?

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Question 140(ii) Consider a quantity of a radioactive substance. The fraction of this quantity that remains after t half-lives can be found by using the expression 3−t. After how many half-lives will the fraction be 1243 of the original?

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