In a fluorescent tube, how are the atoms in the tube excited?

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As there is a potential difference in the fluorescent tube. Electrons will flow from negative to the positive . These electrons collide with the orbital electrons in the atoms of the fluorescent tube. As there is an energy transfer from the free moving electron to the orbital electrons. The orbital electrons gain energy and become excited. They now exist on a higher enery level until they de-excite.

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