Una masa de 100 gr. de alcohol etílico se encuentra en estado sólido a una temperatura de -115 °C ¿Qué cantidad de calor mínima se requiere para
transformar totalmente en vapor? (c=0.60 cal/gr°C; Lf = 25 cal/gr. ; Le = 204 cal/gr)

Materials will have different energies associated with the electrons inside them. this is related to how strongly bound they are by their work function. if we sandwich a material with a very low energy between two materials with a high energy, we create a trap for an electron. if this trap is very narrow in one direction in comparison to the others, this is approximately a 1-dimensional box that confines the electron. what is the lowest energy of an electron in the box if the thinnest direction across the materials is 4.81 nm?