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What is electron emission ?

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What is electron emission ?

Posted by Student Of The Year 4 years, 9 months ago

CBSE > Class 12 > Physics

4 answers

Vansh Rana 4 years, 9 months ago

This is the phenomenon in which electron get split from the surface of metal when sunlight fall in the metal surface.

Drishty Kamboj 4 years, 9 months ago

The phenomenon of emission of elctron from photosensitive metals(Na,Cs,Rd) when light of particular frequency is incident on its surface

Tanya ?? 4 years, 9 months ago

The phenomenon of emission of electrons from the surface of metal is called electron emission.

Gaurav Seth 4 years, 9 months ago

The process of emission of electrons from the metal surface when a certain amount of energy is absorbed by the metal, is called electron emission
There are free electrons on the metal surface, present in the outermost (valence) shell that are loosely bound to the nucleus
These electrons are emitted when a certain minimum amount of external energy is provided to the metal surface. This least value of energy is called work function of metal (denoted by Φ₀)
The unit of Φ₀ is electron volt(eV). 1eV is defined as the energy needed to accelerate an electron through the potential difference of 1volt(V).
Work function of a material depends mainly on the nature of metal, and electronic configuration of metal (meaning the number of valence shell electrons, lesser the number, lesser the work function)

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