What is threshold frequency?

 



Threshold frequency is a term used in the context of the photoelectric effect, which is the phenomenon where electrons are emitted from a material when it is exposed to electromagnetic radiation, such as light.

The threshold frequency is the minimum frequency of the incident radiation required to cause the emission of electrons from a given material. Below this frequency, the material does not emit any electrons, regardless of the intensity of the incident radiation.

This phenomenon can be explained by the particle-like nature of light, as described by the quantum theory. According to this theory, light is made up of packets of energy called photons, and each photon has a specific frequency and energy. When a photon strikes an atom in the material, it can transfer its energy to an electron in the atom, causing it to escape from the material. However, the energy required to liberate the electron depends on the material's properties, and it's different for each material. The threshold frequency is, therefore, a characteristic property of a given material, and it can be used to determine the minimum energy required to eject an electron from that material.

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