Three substances are poured in a cylinder with different densities. Draw the cylinder with the three layers and identify the substance in each layer. The three substances(with their densities) are mercury (13.55 g/mL), ethyl alcohol (0.78 g/mL) and lead (11.4 g/mL).

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.