Asked by Anonymous

what is the time necessary for 99.9%of the atoms of a radioactive compound to be disintegrated? t½=5times.

Answers

Answered by bobpursley
.001=e^-.692t

where t is in halfflives...

ln(.001)=.692t
-6.91=-.692t
t=10 halflives...

Lets look at five halfflives...

xxx=e^-.692*5
xxx= 0.031429762 or .97 is gone in five halflives...

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