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Gas-Filled Tube

Gas-Filled Tube     A gas-filled tube is essentially a vacuum tube having a small amount of some inert gas at low pressure. The gas pressure...

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Photo Electric Emission

Photo Electric Emission   Electron emission from a metallic surface by the application of light is known as photo electric emission. When a ...

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Field Emission & Secondary Emission

Field Emission   The process of electron emission by the application of strong electric field at the surface of a metal is known as field em...

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Thermionic Emission

Thermionic Emission   The process of electron emission from a metal surface by supplying thermal energy to it is known as thermionic emissio...

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Types of Electron Emission

Types of Electron Emission   The electron emission from the surface of a metal is possible only if sufficient additional energy (equal to th...

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Analog and Digital Signals

Analog Signal   A Countinuously varying signal (voltage or current) is called an analog signal. for Example an alternating voltage varying s...

Engineer Simple