An electron is bound in a square well of width 1.30nm and depth U=6E?, where E? is the ground-state energy for an infinitely deep potential well.

Part A If the electron is initially in the ground level, E1=0.625E?, and absorbs a photon, what maximum wavelength can the photon have and still liberate the electron from the well? Express your answer numerically in meters using three significant figures. ? = m