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I am an electrical engineer who is easily distracted by physics.


Dec
2
awarded  Benefactor
Dec
2
comment Why does only one side of a neon lamp glow?
Combining you answer with sh37211's, it seems the electrons are accelerated toward the anode, where they have sufficient energy to ionize gas atoms, and then the gas ions are accelerated toward the cathode, until they gain enough energy to excite neutral gas atoms in collisions, and those neutral gas atoms relaxing to non-excited state is what emits most of the light, so the ions being faster at the cathode end is why there is more light there? Maybe the spectrum varies from end to end because the neutral atoms are excited to different states?
Dec
2
comment Does (will) wind affect plasma (electical spark passing through a gap)?
It's more similar to fire than to light. :)
Dec
2
comment Are the ions in a fluorescent lamps concentrated near the electrodes?
"Fluorescent lamps may get dim at one end with DC. Since the mercury vapor ionizes more easily than the argon, some of it exists as positive ions. This can cause the mercury to be pulled to the negative end of the tube, resulting in a mercury shortage at the positive end. This is more of a problem with longer length and smaller diameter tubes. ... Some ... have special switches to reverse polarity every time the fixture is started. This balances electrode wear and reduces mercury distribution problems." repairfaq.org/sam/dlamp.htm
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revised Why does only one side of a neon lamp glow?
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revised Why does only one side of a neon lamp glow?
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suggested approved edit on Why does only one side of a neon lamp glow?
Dec
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comment Why does only one side of a neon lamp glow?
Can you summarize your reference instead of just linking? Your reference says "A neon display lamp uses the positive column for its light", which would seem to mean the positive end glows, which is not the case in reality.
Nov
27
comment Why does only one side of a neon lamp glow?
As I pointed out in another comment, the talk page of Wikipedia:Glow discharge says "Sputtering of the cathode, on the other hand, is not at all important for a glow discharge. It is merely a side effect." Also the neon lamp article says that sputtering wears the electrodes and darkens the lamp over time by coating the surface of the glass with metal.
Nov
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Nov
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revised Why does only one side of a neon lamp glow?
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revised Why does only one side of a neon lamp glow?
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Nov
25
comment Why the galaxies forms 2D plane (or spiral-like) instead of 3D ball (or spherical-like)?
"Stars also do not collide"? How so? Even if they don't collide head-on, but pass each other somewhat closely, they will both be deflected by each other's gravitational field.
Nov
25
suggested approved edit on Why does only one side of a neon lamp glow?
Nov
25
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Nov
25
revised Can Ionocrafts be improved by breaking them up into multiple stages?
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