A beam of 11 eV electrons is directed towards a barrier of potential Vo = 3.8 eV. Compute the width of the barrier for which the reflection is maximized (Note: this is NOT asking for when reflection is 100%). Transmission probability for E > Vo: T = [ 1 + (Vo²*sin²(βa))/(4E*(E - Vo)) ]^(-1) where a is the width of the barrier. I need a bit of help starting this question. I do not understand why maximum reflection is not 100% reflection, or T = 0. Finding when something is a maximum makes me think "derivative = 0," but other than that I'm really unsure about where to go. And there is a formula for β but I am not very concerned with numerical answers right now. Any advice is appreciated.