why electrical domestic tube light gives white fluorescent light explain
Answers
Answer:
An electric current in the gas excites mercury vapor, which produces short-wave ultraviolet light that then causes a phosphor coating on the inside of the lamp to glow. A fluorescent lamp converts electrical energy into useful light much more efficiently than incandescent lamps.
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Answer:
It's a very interesting question. .. the glass tube contains a small amount of mercury liquid, an electric heater and the inside walls of the tube are coated with a mixture of flouresent phosphors.
When switched on the heaters turn the mercury into a vapour, the the high voltage is applied and an arc discharge flows through the tube from end to end.
The mercury atoms are being bombarded by electrons in the current, and become ionised and sustains a flow. The mercury produces photons of UV light in all directions. The UV photons then hit the phosphors on the walls and they emit visible light photons. Depending on the mix of phosphor chemicals used, the visible light can be adjusted to mimic daylight or other spectrums. .
In night clubs etc, these tubes without the wall of phosphor, emit UV light alone and is often used to give a glowing from shirts etc.. where phosphors are used in washing powders to brighten whites.
Incredibly this long winded process provides more light for the same energy than simply heating up a filiment.