Asked by Milly

A radioactive material has a half life of 500 years.
A) Given 20 grams of this material, how much will remain after 1,000 years?
B) Given 100 grams of this material, how much will remain after 750 years?

Thank you to whom ever can help me :)
Answered by Steve
well, 1000 years is 2 half-lives, so ...