Question

In the fluorescent lamp, what is the gases in the tube used to conduct electricity, why can't we just let electrons do that or it is impossible for electron to reach the another end of the fluorescence tube??

Answer 1

The point of the lamp is the produce light. With a gas (or gases) in the tube, the electrons moving from the cathode to the anode give energy the gas atoms. This is called exciting the gas atoms. Those gas then reemit that energy in a very precise way, by emitting photons, which we perceive as light.

For the details of the fluorescent lamp, see this:
http://en.wikipedia.org/wiki/Fluorescent_lamp

Answer 2

what about mercury vapor?

Answer 3

http://static.ddmcdn.com/gif/fluorescent-lamp-1.gif

As the wikipedia article explains, a fluorescent lamp creates visible light in two steps. First the electrons excite mercury atoms. Those atoms emit ultraviolet light. The ultraviolet light in turn excites phosphor, which in turn emits visible light.

Answer 4

is there any argon gases or any other gases in the normal house hold fluorescence lamp?

Answer 5

You'll notice in the last diagram we need an inert gas in which we have the mercury vapor. That gas is usually argon gas.

Answer 6

that mercury atoms is the mercury ion from the vaporization of mercury liquid in the lamp?

Answer 7

Read the wikipedia article and/or this:
http://home.howstuffworks.com/fluorescent-lamp2.htm

Answer 8

so what will happen if there is no argon or other gases, will the electron still able to flow?

Answer 9

From the 'howstuffworks' site:
"When you turn the lamp on, the current flows through the electrical circuit to the electrodes. There is a considerable voltage across the electrodes, so ***electrons will migrate through the gas from one end of the tube to the other.***"

Electrons usually don't 'flow' in a vacuum; it takes an electrostatic breakdown, which we see as sparks.

Answer 10

ok i get it ^^ ty