Question

What percentage of strontium-90 remains in a sample after three half-lives have passed?

Answer 1

12.5%


15%


25%


60%

Answer 2

well it is going to decay exponentially.

So once you hit 50% you have to half that again, then once it hits half that you have to halve it again

Answer 3

Would the teacher be using this as an example from 100? because that question is all of the information given, along with the choices of course

Answer 4

You dont need the half life of strontium 90 to figure this out. I pretty much gave you the answer.

A half life is the amount of time it takes for something to decay to half its original amount.

Answer 5

12.5%?

Answer 6

If something that is at a 100% passes through three half lives that means its going to be cut in half three times. Take 100% and cut that in half, that is one half life, then cut the half of 100% in half that is two half lives, then cut the half of the half of 100% in half to get the amount left over from three half lives

Answer 7

This is called exponential decay and yes your guess is correct :)

Answer 8

Thank you!