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Which of the following are quick electron emission?
(a)
photoelectric emission
(b)
field emission
(c)
secondary emission
(d)
thermoionic emission
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Important Questions on Electron Emission
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Thermionic Emitter
What are the materials used for the thermionic emitters?
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Which of the following is NOT true for cathode rays?
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The thermionic emission current is given by:
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A Vacuum tube will conduct only if its plate is_______with respect to the cathode.
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Oxide coated emitter are used when plate voltage is-
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What started the conduction in a cold cathode tube?
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What is thermionic emission?
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How many types of electron emission exist?
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In field emission the electric field is applied of the order of
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The process by which free electrons are emitted from the surface of a metal when external heat energy is applied is called_____.
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A Vacuum tube is normally operated in the temperature saturation region.
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For a given plate voltage. if
-
ve
potential on the control grid of triode is increased, the plate current
MEDIUM
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Modern Physics
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Electron Emission
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Thermionic Emitter
The energy gained by a electron when it has been accelerated by a potential difference of
1
volt is equal to
EASY
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Electron Emission
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Thermionic Emitter
What emitter is used in X-ray tube?
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Modern Physics
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Electron Emission
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Thermionic Emitter
Thermionic emission occurs in
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The potential difference that must be applied to stop the fastest photoelectrons emitted by nickel surface, having work function
5
.
01
eV
, when ultraviolet light of
200
nm
falls on it, must be
HARD
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Thermionic Emitter
There is an increase in threonic current when the
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Depending upon the type of emitter the temperature used for thermionic emission varies is between-
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One electron volt energy is equal to the:
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A Vacuum tube can be used as
