At which instance contain 1 molecule of substances from following? (1). Hydrogen atoms of 2g of Hydrogen
(2). Oxygen atoms of 8g of Oxygen
(3). Water molecules of 8g of water
(4). Methane molecules of 16g of methane

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.