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.

(on edge) C. Visible light, regardless of color, will cause the ejection of electrons when striking metal.

Visible light, regardless of color, will cause the ejection of electrons when striking metal.

Explanation:

When light rays having frequency equal or greater than the threshold frequency of the metal when fall on it eject electrons. This is known as photoelectric effect.

A minimum frequency of the light equal to threshold frequency is required to be incident on the metal for the photoelectric effect to occur.

Light has dual nature. Sometimes it depicts wave nature and sometimes particle nature. Phenomenons such as interference and diffraction show the wave nature of light. This showed the particle nature of light. Light is composed of photons- quanta of energy.

If the frequency of the light is greater than the threshold frequency of the metal, the ejected electrons would move with certain kinetic energy = frequency of the light -  threshold frequency.

Thus, the theory that all visible lights can eject electrons from metal regardless of their frequency (color) was contradicted by the photoelectric effect.