why does an electron beam in a cathode ray tube look blue?

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Offline mcjhn

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thanks!

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Offline graham.d

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why does an electron beam in a cathode ray tube look blue?
« Reply #1 on: 17/02/2011 13:39:54 »
It shouldn't I think. You should not be able to see the beam at all unless there is some contaminating gas in the tube.

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Offline bardman

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why does an electron beam in a cathode ray tube look blue?
« Reply #2 on: 17/02/2011 17:55:00 »
You are probably not dealing with simply a vacuum tube. You are probably dealing with the ionization of gas in a tube. I would have to do research to determine which gas produces blue light. However, that is probably what is happening.

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Offline bardman

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why does an electron beam in a cathode ray tube look blue?
« Reply #3 on: 17/02/2011 18:13:28 »
I think you may have been looking at a krypton filled tube. Check out the link http://www.chemicool.com/elements/krypton.html [nofollow]

Also look up discharge tube or Geissler tube.