SOLUTION: If 800g of a radioactive substance are present initially and 8 years later only 450g remain, how much of the substance will be present after 16 years?

Question 1183275: If 800g of a radioactive substance are present initially and 8 years later only 450g remain, how much of the substance will be present after 16 years?
Found 2 solutions by greenestamps, ikleyn:
Answer by greenestamps(13200)   (Show Source): You can put this solution on YOUR website!

Over the space of 8 years, the amount remaining decreases by a factor of 450/800 = 9/16.

After another 8 years, the amount will again decrease by the same factor.

ANSWER: (9/16)*450 = 253 1/8

Since radioactive decay is a statistical process, it should be okay to round the answer to 253g.

Answer by ikleyn(52794)   (Show Source): You can put this solution on YOUR website!
.

On radioactive decay, see the lesson
    - Radioactive decay problems
in this site.

Find there numerous solved similar and different problems and learn the methods of their solution.

Do not miss this opportunity ( ! )

RELATED QUESTIONS
If 10g of a radioactive substance are present initially and 9yr later only 5 remain, how... (answered by ikleyn)
If 10g of a radioactive substance are present initially and 3 years later only 5g remain, (answered by CubeyThePenguin)
If 10 g of a radioactive substance are present initially and 9 yr later only 5 g... (answered by josgarithmetic)
If 18g of a radioactive substance are present initially and 5 yr later only 9 g remain,... (answered by josgarithmetic)
Please help me with this word problem, I'm out of my depth: If 12 g of a radioactive... (answered by josgarithmetic)
A radioactive substance has a halflife of 120 years. If 200mg of substance was present,... (answered by ewatrrr)
A radioactive substance has a halflife of 120 years. If 200mg of substance was present,... (answered by josgarithmetic)
Suppose that a certain radioactive substance has a half-life of 20 years. If there are... (answered by ankor@dixie-net.com)
My problem is with entering e raised to a negative power on my TI-84 Plus calculator. I... (answered by Edwin McCravy)