Question

A scientist has 37 grams of a radioactive substance that decays exponentially. Assuming R= -0.3, how many grams of radioactive substance remain after 9 days?

Answer 1

is R the decay constant?

Answer 2

yes

Answer 3

\[N(t)=N_0e^{Rt}\]

Answer 4

\[N_0=N(0)=37[\text g]\]

Answer 5

so
\[N(9)=37e^{-0.3\times9}[\text g]\]