Electron emission from a metallic surface by application of light is k

Electron emission from a metallic surface by application of light is known as

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Thermionic emission

Photoelectric emission

High field emission

Autoelectronic emission

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This question was previously asked in

UPSC NDA-2 – 2017

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Electron emission from a metallic surface caused by the application of light is known as the photoelectric effect, and the emission itself is called photoelectric emission. When light of sufficient frequency strikes a metal surface, it can impart enough energy to electrons to overcome the work function (binding energy) and be ejected from the surface.

– Photoelectric emission is electron emission triggered by light.
– This phenomenon is the basis of the photoelectric effect.

Thermionic emission is electron emission due to heat. High field emission (or field emission or autoelectronic emission) is electron emission caused by a strong electric field. These are different mechanisms for electron emission from surfaces.

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