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.

The correct answer is: Visible light, regardless of color, will cause the ejection of electrons when striking metal.<br /><br />The photoelectric effect experiments conducted by Albert Einstein in 1905 contradicted the theory that visible light, regardless of color, will cause the ejection of electrons when striking metal. The experiments showed that only light with a frequency higher than a certain threshold could cause the ejection of electrons from a metal surface. This led to the development of the quantum theory of light, which states that light is composed of discrete packets of energy called photons, and the energy of each photon is proportional to its frequency.