Question

A substance has a haft life of 1,523 years .What is fraction of the substance would be left after 10,000 years

Answer 1

\[A _{1}=A _{0}e ^{kt}\]\[A=e ^{1/2(10,000/1523)}\] am i right with my formula?

Answer 2

@jerwyn gayo
No, it specifically says,half life so it goes like this:

Substance left = \[\frac{1}{2}^{\frac{time}{halflife}}\]
or,
\[\frac{1}{2}^{\frac{1000}{1523}}\ \approx 0.01055\]

Answer 3

@rlsadiz, you mean there is no (e)?