Electron Emission

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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What is Secondary Emission?

What is Secondary Emission? When a beam of high velocity electrons suddenly strikes a metallic surface, they give up their kinetic energy to electrons and atoms which they strike. Some of the bombarding electrons, called the primary electrons, collide directly with free electrons on the metal surface, and may knock them out from the surface,

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What is Thermionic Emission?

What is Thermionic Emission? A very common method used for electron emission is by heating the metal piece to a high temperature. The process of electron emission from the surface of metal into the surrounding space by heating the material is known as thermionic emission. As the temperature of the metal piece rises, a point

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What is Electron Emission?

What is Electron Emission? The liberation of electrons from the surface of a substance is known as electron emission. For electron emission, metals are employed because they have many free electrons. In a metal like copper, platinum or tungsten, there are plenty of free electrons. At room temperature these electrons are free only to the

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Explain Bohr’s Atomic Model

Explain Bohr’s Atomic Model: Bohr’s Atomic Model – Neils Bohr, a Danish physicist, put forward his model of atom in 1913. He retained Rutherford’s model of a very small positively charged nucleus at the centre. He also accepted the view that all the protons and neutrons (and hence most of the mass of the atom)

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