Question

Question #18b2d

Answer 1

12.6 days.

Explanation:

`sf(N_t=N_0e^(-lambdat))`

`sf(lambda=0.693/t_(1/2)=0.693/3.8=0.1823color(white)(x)"d"^(-1))`

`sf(0.1=e^(-lambdat))`

`:.` `sf(ln(0.1)=-lambdat)`

`sf(t=-(-2.302/0.1823)=12.6color(white)(x)d)`