How many moles of H2 are contained in a balloon that has a volume of 28.3 cm3 at 25.0°C and a total pressure of 1.001 atm?

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.