Question

If there is 520 grams of radioactive material with a half-life of 12 hours, how much of the radioactive material will be left after 72 hours and is the radioactive decay modeled by a linear function or an exponential function?

Answer 1

This is a fairly easy half-life problem
Each half-life reduces the radioactive material by one half.
So after 72 hours the radioactive material would have undergone 6 half-lives. 
2^6 = 64.
So, there will be one sixty-fourth of the material left.
520 / 64 = 8.125 grams will remain.
radioactive decay is an exponential decay function.

Source:
http://www.1728.org/halflife.htm

Answer 2

Answer:

b

Step-by-step explanation: