Question 977792
LN(1/2) is the natural logarithm which is base e, therefore
LN(1/2) =  -6.9314718056e-1
5700k =  -6.9314718056e-1
k =  -6.9314718056e-1 /5700
k = −1.216047685e−4
k = −0.000121605