Question

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

Answer 1

There are several important features of the photoelectric effect that cannot be explained by the classical theory of electromagnetic waves. These are the following. Electrons are ejected only when the frequency of the incident light is higher than a threshold value, fo, regardless of how intense the light is.

Answer 2

The theory that was contradicted by various experiments with the photoelectric effect is that visible light, no matter what colour they are will eject the electrons when it strikes a metal.

EXPLANATION:

• Whenever a light ray has a frequency that is equal to or greater than the threshold frequency of metal, it ejects electrons. This effect is known as the photoelectric effect.

• In order for the photoelectric effect to occur, a small frequency of light that is equal to threshold frequency is necessary on the metal.

To know more:

Cesium show photoelectric effect to the max. extent. why?

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In photoelectric effect, why should the photoelectric current increase as the intensity of monochromatic radiation incident on a photosensitive surface is increased? Explain.

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