Question

A scientist is measuring the amount of radioactive material in an unknown substance. When he begins measuring, there are 12.8 grams of radioactive substance. 9 days later, there are 7.33 grams. After 14 days, there are 5.38 grams. After 30 days, there are 2.00 grams. Assuming that the decay is exponential, find the equation that determines the number of grams remaining after x days and use the equation to determine the amount of radioactive material remaining after 50 days.
A. 0.56 g
B. 0.58 g
C. 3.27 g
D. 3.33 g

Answer 1

@AllTehMaffs

Answer 2

can you tell me how to get my answeR?

Answer 3

Is this for calc?

Answer 4

statistics

Answer 5

hmph. I don't know how to do that using statistics :/ Do you have an equation for exponential decay or halflife that you've used in class? something that looks like

\[N_{(t)} = N_o^{-kt}\]

Answer 6

Does that help?