A radioactive isotope has a half-life of 16 days. We have 30 g at the end of 30 days. How much radioisotope was initially present?

Question.

A radioactive isotope has a half-life of 16 days. We have 30 g at the end of 30 days. How much radioisotope was initially present?

 

Solution:

 

          ,          

We know that

 

Half life is 16 days i.e

 

Now using initial condition , we get

 

Put and solve for

grams