The electrical domestic tube light gives white fluorescent light because of

Colision between molecules of filled gas under electric current
Heavy current
Vacuum inside the tube
Falling of ultra violet rays on the white inner coating of the tube
Falling of ultra violet rays on the white inner coating of the tube  The electrical domestic tube light gives white fluorescent light because of falling of ultra violet rays on the white inner coating of the tube. The ultraviolet rays have high frequency and shorter wavelength are converted to visible white light with lower frequency and greater wave length.

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