Which of the following statements describes a difference between incandescent lamps and fluorescent lamps used in illumination?
Incandescent lamps produce light by heating a filament, while fluorescent lamps use a gas discharge process.
The genuine, general difference between incandescent and fluorescent lamps lies in the physical mechanism each uses to turn electricity into light, not in their shape or where they are used.
An incandescent lamp passes current through a thin tungsten filament until it becomes white-hot and glows; the light therefore comes from heating the filament, a process called incandescence.
A fluorescent lamp works quite differently: it strikes an electric discharge through a low-pressure gas and mercury vapour, which emits ultraviolet light.
A phosphor coating on the inside of the tube then absorbs that ultraviolet and re-emits it as visible light, and no glowing filament produces the main light.
So the correct distinction is filament heating versus gas discharge, which is why the third statement is right.
The claims about decorative-versus-commercial use, tube-versus-round shape, and table-lamp-versus-ceiling fittings are all false generalisations, since both lamp types come in many shapes and are used in many places.
Hence, the answer is Incandescent lamps produce light by heating a filament, while fluorescent lamps use a gas discharge process..
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Which of the following best describes a LASER light?
Which of the following methods of lighting calculation can be used for rough calculations and checking purposes?
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How many 200 linear lamps are required to obtain a minimum illuminance of 50 lux in a 5 m and 8 m rectangular hall?
