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  • Among the following which of the following statements is true about thermionic emission?Option: 1 It occurs when electrons are ejected from a metal s

Among the following which of the following statements is true about thermionic emission?

Option: 1

It occurs when electrons are ejected from a metal surface due to high-energy radiation.


Option: 2

It occurs when additional energy is given to electrons to overcome a potential barrier in the form of heat.


Option: 3

 It occurs when an electric field is applied to a metal surface, causing electrons to be emitted.


Option: 4

 It occurs when a metal surface is bombarded with high-energy particles, causing electrons to be emitted.


Answers (1)

best_answer

 In thermionic emission, electrons are emitted from a metal surface when additional energy is given to them in the form of heat. This is typically achieved by passing an electric current through a filament, which heats up and causes electrons to be emitted from the surface of the filament. The emitted electrons can then be used for a variety of applications, including in vacuum tubes and electron microscopes.


 

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