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How many types of electron emission exist?

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Important Questions on Electron Emission

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Physics>Modern Physics>Electron Emission>Thermionic Emitter
The thermionic emission current is given by:
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Physics>Modern Physics>Electron Emission>Thermionic Emitter

Correct the following sentence:

The emission current density from a heated filament obeys Child's law.

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Physics>Modern Physics>Electron Emission>Thermionic Emitter
By what equation thermionic equation is explained?
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Physics>Modern Physics>Electron Emission>Thermionic Emitter
Thermionic emission is dependent on temperature:
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Physics>Modern Physics>Electron Emission>Thermionic Emitter
A Vacuum tube can be used as 
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Physics>Modern Physics>Electron Emission>Thermionic Emitter

Correct the following sentence:

In thermionic emission current varies with temperature of the filament as T1/2.

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Physics>Modern Physics>Electron Emission>Thermionic Emitter
Which of the following is NOT true for cathode rays?
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Physics>Modern Physics>Electron Emission>Thermionic Emitter

In thermionic emission, the thermionic current varies with temperature of the filament as:

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Physics>Modern Physics>Electron Emission>Thermionic Emitter
A Vacuum tube is normally operated in the temperature saturation region.
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Physics>Modern Physics>Electron Emission>Thermionic Emitter
Write Richardson-Dushman equation of thermionic equation?
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Physics>Modern Physics>Electron Emission>Thermionic Emitter
A Vacuum tube will conduct only if its plate is_______with respect to the cathode.
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Physics>Modern Physics>Electron Emission>Thermionic Emitter
What emitter is used in X-ray tube?
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Physics>Modern Physics>Electron Emission>Thermionic Emitter
The emission current density from a heated filament obeys _____ law.
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Physics>Modern Physics>Electron Emission>Thermionic Emitter
Thermionic emission occurs in 
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Physics>Modern Physics>Electron Emission>Thermionic Emitter
What are the advantages of indirectly heated cathode over the directly heated cathode?
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Physics>Modern Physics>Electron Emission>Thermionic Emitter
Why cathode is heated in vacuum.
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Physics>Modern Physics>Electron Emission>Thermionic Emitter
Cotyledons are also called-
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Physics>Modern Physics>Electron Emission>Thermionic Emitter
There is an increase in threonic current when the
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Physics>Modern Physics>Electron Emission>Thermionic Emitter
Cathodes are coated with barium oxide to lower the thermionic work function.
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Physics>Modern Physics>Electron Emission>Thermionic Emitter
For a given plate voltage. if -ve potential on the control grid of triode is increased, the plate current