Question
The half life of a radioactive sample is 6.93 days.after how many days will only one -tenth of the sample be left behind?
Answers
bobpursley
.1=e^-.693t/6.93
.1=e^-.1
ln.1=.1t
t=-10ln(.1)
.1=e^-.1
ln.1=.1t
t=-10ln(.1)