Thermionic Emission
Assessment
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CHEANG Moe
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Physics
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1st - 2nd Grade
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76 plays
•
Medium
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15 questions
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1.
Multiple Choice
one of the properties of cathode rays is
positive charge
does not move in a straight line
can be deflected by electrical field
cannot be deflected by magnetic field
2.
Multiple Choice
If an electric field is put across the beam with the positive plate on top and the negative plate below.
The beam will bend
Up
down
left
right
in a circle
3.
Multiple Choice
I use thermionic emission to emit a stream of electrons and display them on a screen.
Cathode-Ray Oscilloscope
Raster-Scan Display
Random-Scan Display
4.
Multiple Choice
Process of emission of electrons from hot metal surfaces is called
photoelectric effect
thermionic emission
static emission
emission current
5.
Multiple Choice
Particles emitted from a hot cathode surface are:
negative ions
photon
protons
electrons
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