Electron Emission

What is Cathode or Emitter and Types of Cathode?

What is Cathode or Emitter and Types of Cathode? The substance employed for electron emission is called a cathode or emitter. It is an essential part of an electron tube. The usefulness of a particular material as an emitter depends on (i) emission efficiency (ii) mechanical strength (iii) longevity at normal operating temperatures and (iv) …

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What is Photoelectric Emission and Laws of Photoelectric Emission?

What is Photoelectric Emission and Laws of Photoelectric Emission?: When the surface of certain alkaline material such as sodium, potassium, cesium or rubidium is illuminated by a beam of light or ultraviolet radiations, the electrons are emitted. The phenomenon is called the photoelectric emission. The work function of the alkaline materials is very low and …

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