Question

A substance has half-life 50 years. If 80 grams of the substance are present

initially, how many grams of the substance remain after 150 years?

Answer 1

After 150 years, 10 grams of the substance will remain.

This is because the half-life of the substance is 50 years, so 150 years is 3 half-lives.

This means that the amount of the substance present will be reduced to one-eighth of its original amount, which is 80 divided by 8, which is 10 grams.