Homework Help: physics

Posted by Mira on Wednesday, August 1, 2012 at 2:37am.

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?

physics - bobpursley, Wednesday, August 1, 2012 at 8:39am
.1=e^-.693t/6.93
.1=e^-.1
ln.1=.1t
t=-10ln(.1)

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