Question

e 1. What do you mean by electron emission? Explain briefly various methods of electron emission. ​

Answer 1

Answer:

Here you go

Explanation:

What is Electron Emission ?  

The phenomenon of electron emission is characterized as the liberation of electrons from the that is induced by a change in the temperature,

radiation , or from a strong electric field.e ,  

Various methods of electron emission  :

[A] Photoemission :  

The release of electrons from a normally SOLID MATERIAL using “energy” provided by the incidence of radiation , most commonly by LIGHT.

[B] Thermionic Emission :  

Thermionic emission is the discharge of electrons from heated materials and is commonly utilized as an electron source in electron tubes.

[C] Field Emission :  

The emission of electrons from a metallic surface when it is exposed to a high electric field.

Hope this helps you :)

Answer 2

Answer:

Electron emission is defined as a phenomenon of liberation of electron from the surface that is stimulated by temperature elevation, radiation, or by strong electric field. Electron emission from a material surface occurs through three main possible processes; photoemission, thermionic emission, and field emission (Jensen, 2007b). Photoemission occurs when an electron absorbs photonic energy allowing the electron to emit above the vacuum level.