Thorium-229 is the radioactive substance that gives lantern mantels their eerie glow. The half life of thorium-229 is 7340 years.
If one mantel consists of 0.25 grams of thorium, how much thorium will remain after 14,680 years?
A) 0.0625g
B) 0.125g
C) 0.25g
D) 1.0g
