SOLUTION: Superman has been disabled by a nearby amount of Kryptonite. He cannot regain his power until 90% of the kryptonite disntegrates. If the half life of Kryptonite is 5 days, how l

Question 379109: Superman has been disabled by a nearby amount of Kryptonite. He cannot regain his power until 90% of the kryptonite disntegrates. If the half life of Kryptonite is 5 days, how long will it be before he regains his powers?
Answer by ankor@dixie-net.com(22740) (Show Source): You can put this solution on YOUR website!
. He cannot regain his power until 90% of the kryptonite disntegrates.
If the half life of Kryptonite is 5 days, how long will it be before he regains his powers?
:
The remaining amt = .1
:
The half life equation
2^(-t/5) = .1
=
= -3.3212
t = -5*-3.3212
t = 16.6 days
:
:
Check on a calc: enter 2^(-16.6/5}, results .100

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