Question

Radium -226 has a half life of about 110 years. After 350 years how much radium would be left if you started with 1700 mg?

Answer 1

\[C _{f}=C _{o}\left(\begin{matrix}\frac{ 1 }{ 2 }\end{matrix}\right)^{\frac{ time }{ half-life }}\]

Answer 2

Another formula for continuous decay is

\[C _{f}=C _{o}e ^{-\lambda*t}\]

Where \[\lambda=\frac{ \ln2 }{ half-life }\]

Answer 3

y = 1700 * (.5)^(350/110)

y = 1700 * .1102

y = ? @Tyndall25

Post what you get, okay?

Also, check out the online half-life calculator at this link:

http://www.calculator.net/half-life-calculator.html

Answer 4

187.34

Answer 5

That's what I got.