The given two Equation are employed to calculate Neff. Show that this relation is equivalent:

$N_{\text{e}\text{f}\text{f}}=5\mathrm{.}54\frac{(t_R-t_M{)}^2}{w_{\frac{1}{2}}^2}$

$N_{\text{e}\text{f}\text{f}}=N\frac{k^2}{(k+1{)}^2}$