Smartphone batteries contain a casing that surrounds it that is made up out of aluminium. What would best describe the properties of aluminium that enables it to be used for such purposes?

Which theory was contradicted by experiments with the photoelectric effect? light spreads out after it passes through a small opening. as soon as light strikes metal, electrons will be ejected. visible light, regardless of color, will cause the ejection of electrons when striking metal. the kinetic energy of ejected electrons depends on the frequency of light that strikes the metal.