Question

The fluorescent tubes and neon sign bulbs glow because of

Answer 1

Presence of charged particles
Is The Main Reason For Glow In Neon And Fluorescent Tubes

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Answer 2

When an application of high voltage is provided to the electrodes, the neon gas ionizes due to the flow of e− which thereby excite the neon gas atoms and cause them to emit light. In the case of fluorescent tubes, low-pressure mercury vapour is present which emits UV light when ionized.