Question

The function may be used to model radioactive decay. Q(t) =Q_o e^-kt
Q represents the quantity remaining after t years; k is the decay constant, 0.00011. How long, in years, will it take for a quantity of plutonium-240 to decay to 25% of its original amount
The answer choices :
12,600 years

3,150 years

9,450 years

1,575 years

Answer 1

I don't recognize Q_o

Answer 2

darn

Answer 3

http://openstudy.com/study#/updates/51f0b5b9e4b00daf471b0c1f

Answer 4

You need to learn how to use google more efficiently.

Answer 5

I tried google, o.o