2. Suppose we build two quantum well devices ((1) and (2)) to emit red and blue light. 1) Draw the potential barrier across 81-8281 2) When operated separately, which one emits red light and which one emits blue light? Why? 3) When operated in cascade (pump/emitter), which one can serve as the \"pump\" to incident light (k1) onto the \"emitter\" to create light emission (Re)? Why