- #1
toothpaste666
- 516
- 20
Homework Statement
Homework Equations
N= (N_0) e^(-kT)
k = ln(2)/(T_1/2)
The Attempt at a Solution
N0 = 7.5g
T_1/2 = 22.3 years
T = 17.5 years
k = ln(2)/22.3 = .031
N = 7.5 e^(-.031 * 17.5)
N = 4.36 g
So I chose A, but the correct answer was B. can't figure out where I went wrong