Plutonium-240 decays according to the function
Q(t)=Qoe^-kt
Where Q represents the quantity remaining after t years and k is the decay constant, 0.00011...How long will it take 36 grams of plutonium-240 to decay to 12 grams?

Question

Plutonium-240 decays according to the function
Q(t)=Qoe^-kt
Where Q represents the quantity remaining after t years and k is the decay constant, 0.00011...How long will it take 36 grams of plutonium-240 to decay to 12 grams?

anonymous · Answer

Qo=36
Q(t)=12
k - 0.00011

Plug in and solve for t
$$12=36e^{-0.00011t}$$

lilmike234 · Answer

And I'll get 2,100b right ?