Question 1009518: Half life/ decay question? Thank you!
I happen to have 10 pounds of the most radioactive material on Earth buried in my backyard. The half life of the material is 2345 years.
a.) How long will it take for 5 pounds of the material to decay?
b.) How long will it take for there to be 2 pounds remaining?
c.) How much is remaining after 1000 years?
Answer by josgarithmetic(39620)   (Show Source):
You can put this solution on YOUR website! Basic model  '
y, amount after time t
p, initial amount for t=0
k, the decay constant
t, time passage
Example for the question mostly uses p=10.
(a) means, use the half-life;
(b) means, p=10,y=2, to find t for these.
(c) means, p=10, t=1000, find y.
Use algebra and skills with log and exponential functions.
 -----this equation will be used in two ways.
Maybe you can do the rest of the solution on your own based on this?
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