Question

A substance has a half-life of 3 years. If 2000 grams are present initially, how much will remain after 1.5 years?

Answer 1

1414 grams

Explanation:

Decay can be modeled with an exponential decay:
`2000(1/2)^n` n would be time passed in years or number of half lives completed. 1.5 years is 1/2 of the half life so we will put n as 1/2 to get 1414 grams. To sig figs if necessary, 1000g