Bromine-82 has a half of about 35 hours. After 140 hour, how many milliliters of an 80 mL sample will remain? A,65mL B.20mL C.10mL D.5mL
Question
Answer:
[tex]\bf \textit{Amount for Exponential Decay using Half-Life}
\\\\
A=P\left( \frac{1}{2} \right)^{\frac{t}{h}}\qquad
\begin{cases}
A=\textit{accumulated amount}\\
P=\textit{initial amount}\to &80\\
t=\textit{elapsed time}\to &140\\
h=\textit{half-life}\to &35
\end{cases}
\\\\\\
A=80\left( \frac{1}{2} \right)^{\frac{140}{35}}\implies A=80\left( \frac{1}{2} \right)^4[/tex]
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