Problem # 3 (10 points) An electron is bound in a one-dimensional quantum well with a width of 120A. = (2X / O (a) Calculate the first four energy levels that the electron may occupy. (b) If the electron drops from the fourth to the second energy level, what is the wavelength of the photon that might be emitted? (c) What will be the light color of the emitted photon? Mention a device that operate using this principle