After 8 yr there will be ?g of a radioactive substance

Stombeur asked Apr 10, 2023

515,794 views

39 votes

Stombeur asked Apr 10, 2023

2.6k points

Your comment on this question:

Email me at this address if a comment is added after mine:Email me if a comment is added after mine

Privacy: Your email address will only be used for sending these notifications.

Email me at this address if my answer is selected or commented on:Email me if my answer is selected or commented on

Privacy: Your email address will only be used for sending these notifications.

14 votes

$\begin{gathered} 9=18e^(-3k) \\ 0.5=e^(-3k) \\ ln(0.5)=-3k \\ k=-(ln(0.5))/(3)=0.23105 \end{gathered}$

Thus;

$\begin{gathered} A=18e^(-0.23105*8) \\ A=2.835 \end{gathered}$

Thus, the remaining amount is 2.835 g

2.6k points

Email me at this address if a comment is added after mine:Email me if a comment is added after mine

Privacy: Your email address will only be used for sending these notifications.

Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

1.6m questions

2.0m answers